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CVE-2026-83520ImportantFix has a known issueRCENetwork

.NET Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Severity
Important
CVSS base score
8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS · 30-day forecast
1.4%FIRST forecast dated 7 Nov 2026, for the following 30 days · FIRST percentile 73.3% · about EPSS
Public detection template
No Nuclei template is listed in the current collected catalog
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Less Likely
Publicly disclosed
No (MSRC assessment)
Customer action
Required: follow the MSRC remediation guidance
Component
.NET
Weakness
CWE-502: Deserialization of Untrusted Data
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
RequiredUI:R
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

22 KBs
KBTypeApplies toKnown issuesOther CVEs
KB5126868 Security UpdateMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016MitigatedUsers might be unable to sign in to OWA or send emails on Exchange ServerAll CVEs in KB5126868
KB5127660 Security UpdateMicrosoft .NET Framework 3.5 on Windows Server 2012None listedAll CVEs in KB5127660
KB5127664 Security UpdateMicrosoft .NET Framework 3.5 on Windows Server 2012 R2None listedAll CVEs in KB5127664
KB5127666 Security UpdateMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809None listedAll CVEs in KB5127666
KB5127667 Security UpdateMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012None listedAll CVEs in KB5127667
KB5127668 Security UpdateMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2None listedAll CVEs in KB5127668
KB5127683 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2None listedAll CVEs in KB5127683
KB5127684 Security UpdateMicrosoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016None listedAll CVEs in KB5127684
KB5127685 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019None listedAll CVEs in KB5127685
KB5127686 Security UpdateMicrosoft .NET Framework 4.8 on Windows Server 2012None listedAll CVEs in KB5127686
KB5127687 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8 on Windows Server 2022None listedAll CVEs in KB5127687
KB5127688 Security UpdateMicrosoft .NET Framework 4.8 on Windows Server 2012 R2None listedAll CVEs in KB5127688
KB5127689 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2None listedAll CVEs in KB5127689
KB5127690 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025None listedAll CVEs in KB5127690
KB5127691 Security UpdateMicrosoft .NET Framework 4.8.1 on Windows 11 version 26H1None listedAll CVEs in KB5127691
KB5127692 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2None listedAll CVEs in KB5127692
KB5127693 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022None listedAll CVEs in KB5127693
KB5127694 Security UpdateMicrosoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2None listedAll CVEs in KB5127694
KB5127696 Security UpdateMicrosoft .NET Framework 3.5 on Windows 11 version 26H1None listedAll CVEs in KB5127696
KB5130034 Security Update.NET 8.0 runtime installed on WindowsNone listedAll CVEs in KB5130034
KB5130035 Security Update.NET 9.0 runtime installed on WindowsNone listedAll CVEs in KB5130035
KB5130036 Security Update.NET 10.0 runtime installed on WindowsNone listedAll CVEs in KB5130036

Affected products

Developer Tools
33 affected products

What changed

  1. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  3. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  5. Detection template: No Nuclei template listed · Customer action: Required: apply the update → Required: follow the MSRC remediation guidance · Public disclosure: No → No (MSRC assessment) · Exploitation detected: Not reported by MSRC → No known exploitation (MSRC assessment)
  6. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  7. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  8. Fixes: KB5126868: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016; KB5127660: Microsoft .NET Framework 3.5 on Windows Server 2012; KB5127664: Microsoft .NET Framework 3.5 on Windows Server 2012 R2; KB5127666: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809; KB5127667: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012; KB5127668: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; KB5127683: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2; KB5127684: Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016; KB5127685: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; KB5127686: Microsoft .NET Framework 4.8 on Windows Server 2012; KB5127687: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; KB5127688: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; KB5127689: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2; KB5127690: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025; KB5127691: Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1; KB5127692: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2; KB5127693: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022; KB5127694: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2; KB5127696: Microsoft .NET Framework 3.5 on Windows 11 version 26H1; KB5130034: .NET 8.0 installed on Windows; KB5130035: .NET 9.0 installed on Windows; KB5130036: .NET 10.0 installed on Windows → KB5126868: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016; KB5127660: Microsoft .NET Framework 3.5 on Windows Server 2012; KB5127664: Microsoft .NET Framework 3.5 on Windows Server 2012 R2; KB5127666: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809; KB5127667: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012; KB5127668: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; KB5127683: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2; KB5127684: Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016; KB5127685: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; KB5127686: Microsoft .NET Framework 4.8 on Windows Server 2012; KB5127687: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; KB5127688: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; KB5127689: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2; KB5127690: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025; KB5127691: Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1; KB5127692: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2; KB5127693: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022; KB5127694: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2; KB5127696: Microsoft .NET Framework 3.5 on Windows 11 version 26H1; KB5130034: .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Windows · Affected products: .NET 10.0 installed on Windows, .NET 11.0 installed on Windows, .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025, Microsoft .NET Framework 3.5 on Windows 11 version 26H1, Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 3.5 on Windows Server 2012 R2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025, Microsoft .NET Framework 3.5 on Windows 11 version 26H1, Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 3.5 on Windows Server 2012 R2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (59)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 7 Nov 2026 · 16:12:44 UTC EPSS1.4%; scored 6 Nov 2026 → 1.4%; scored 7 Nov 2026
  2. 6 Nov 2026 · 19:15:37 UTC EPSS1.4%; scored 5 Nov 2026 → 1.4%; scored 6 Nov 2026
  3. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  5. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  6. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  7. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  8. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  9. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  10. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  11. 5 Nov 2026 · 23:42:03 UTC EPSS1.4%; scored 4 Nov 2026 → 1.4%; scored 5 Nov 2026
  12. 5 Nov 2026 · 02:36:20 UTC EPSS1.4%; scored 3 Nov 2026 → 1.4%; scored 4 Nov 2026
  13. 4 Nov 2026 · 03:04:37 UTC EPSS1.4%; scored 2 Nov 2026 → 1.4%; scored 3 Nov 2026
  14. 3 Nov 2026 · 01:53:36 UTC EPSS1.4%; scored 1 Nov 2026 → 1.4%; scored 2 Nov 2026
  15. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  16. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  17. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  18. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  19. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  20. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  21. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  22. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  23. 2 Nov 2026 · 00:36:51 UTC EPSS1.4%; scored 31 Oct 2026 → 1.4%; scored 1 Nov 2026
  24. 31 Oct 2026 · 18:22:15 UTC EPSS1.4%; scored 30 Oct 2026 → 1.4%; scored 31 Oct 2026
  25. 30 Oct 2026 · 18:02:45 UTC EPSS1.4%; scored 29 Oct 2026 → 1.4%; scored 30 Oct 2026
  26. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  27. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  28. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  29. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  30. 29 Oct 2026 · 18:33:30 UTC EPSS1.4%; scored 28 Oct 2026 → 1.4%; scored 29 Oct 2026
  31. 28 Oct 2026 · 20:00:33 UTC EPSS1.4%; scored 27 Oct 2026 → 1.4%; scored 28 Oct 2026
  32. 27 Oct 2026 · 15:48:13 UTC EPSS1.4%; scored 26 Oct 2026 → 1.4%; scored 27 Oct 2026
  33. 26 Oct 2026 · 23:57:09 UTC EPSS1.4%; scored 25 Oct 2026 → 1.4%; scored 26 Oct 2026
  34. 25 Oct 2026 · 17:12:51 UTC EPSS1.3%; scored 24 Oct 2026 → 1.4%; scored 25 Oct 2026
  35. 25 Oct 2026 · 01:34:18 UTC EPSS1.3%; scored 23 Oct 2026 → 1.3%; scored 24 Oct 2026
  36. 23 Oct 2026 · 15:51:28 UTC EPSS1.3%; scored 22 Oct 2026 → 1.3%; scored 23 Oct 2026
  37. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  38. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  39. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  40. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  41. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  42. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  43. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  44. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  45. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  46. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  47. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  48. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  49. 22 Oct 2026 · 22:02:57 UTC Updates that fix itKB5126868: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016; KB5127660: Microsoft .NET Framework 3.5 on Windows Server 2012; KB5127664: Microsoft .NET Framework 3.5 on Windows Server 2012 R2; KB5127666: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809; KB5127667: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012; KB5127668: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; KB5127683: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2; KB5127684: Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016; KB5127685: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; KB5127686: Microsoft .NET Framework 4.8 on Windows Server 2012; KB5127687: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; KB5127688: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; KB5127689: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2; KB5127690: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025; KB5127691: Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1; KB5127692: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2; KB5127693: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022; KB5127694: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2; KB5127696: Microsoft .NET Framework 3.5 on Windows 11 version 26H1; KB5130034: .NET 8.0 installed on Windows; KB5130035: .NET 9.0 installed on Windows; KB5130036: .NET 10.0 installed on Windows → KB5126868: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016; KB5127660: Microsoft .NET Framework 3.5 on Windows Server 2012; KB5127664: Microsoft .NET Framework 3.5 on Windows Server 2012 R2; KB5127666: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809; KB5127667: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012; KB5127668: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2; KB5127683: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2; KB5127684: Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2016; KB5127685: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019; KB5127686: Microsoft .NET Framework 4.8 on Windows Server 2012; KB5127687: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022; KB5127688: Microsoft .NET Framework 4.8 on Windows Server 2012 R2; KB5127689: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2; KB5127690: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025; KB5127691: Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1; KB5127692: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2; KB5127693: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022; KB5127694: Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2; KB5127696: Microsoft .NET Framework 3.5 on Windows 11 version 26H1; KB5130034: .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Windows
  50. 22 Oct 2026 · 22:02:57 UTC Affected products.NET 10.0 installed on Windows, .NET 11.0 installed on Windows, .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025, Microsoft .NET Framework 3.5 on Windows 11 version 26H1, Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 3.5 on Windows Server 2012 R2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025, Microsoft .NET Framework 3.5 on Windows 11 version 26H1, Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 3.5 on Windows Server 2012 R2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows 10 version 1607, Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
  51. 22 Oct 2026 · 17:33:15 UTC EPSS1.3%; scored 21 Oct 2026 → 1.3%; scored 22 Oct 2026
  52. 21 Oct 2026 · 21:47:24 UTC EPSS1.3%; scored 20 Oct 2026 → 1.3%; scored 21 Oct 2026
  53. 20 Oct 2026 · 20:53:31 UTC EPSS1.3%; scored 19 Oct 2026 → 1.3%; scored 20 Oct 2026
  54. 19 Oct 2026 · 15:12:40 UTC EPSS1.3%; scored 18 Oct 2026 → 1.3%; scored 19 Oct 2026
  55. 18 Oct 2026 · 14:54:30 UTC EPSS1.3%; scored 16 Oct 2026 → 1.3%; scored 18 Oct 2026
  56. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  57. 16 Oct 2026 · 16:13:25 UTC EPSS1.3%; scored 15 Oct 2026 → 1.3%; scored 16 Oct 2026
  58. 15 Oct 2026 · 21:30:54 UTC EPSS1.3%; scored 14 Oct 2026 → 1.3%; scored 15 Oct 2026
  59. 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 1.3%; scored 14 Oct 2026

Explore global source statements, affected packages and advisory history for CVE-2026-83520. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-83520

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 1.43 % · percentile 73.26 % · scored 7 Nov 2026.

Observed 07 Nov 2026 16:07:52 UTC · Complete immutable risk JSON

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

CVE-2026-83520 · 07 Nov 2026 16:07:52 UTC

CVE-2026-83520 · 06 Nov 2026 19:10:17 UTC

CVE-2026-83520 · 05 Nov 2026 22:49:22 UTC

CVE-2026-83520 · 05 Nov 2026 02:54:06 UTC

CVE-2026-83520 · 03 Nov 2026 16:59:18 UTC

CVE-2026-83520 · 02 Nov 2026 23:59:04 UTC

CVE-2026-83520 · 01 Nov 2026 23:58:58 UTC

CVE-2026-83520 · 01 Nov 2026 03:04:52 UTC

CVE-2026-83520 · 31 Oct 2026 01:52:30 UTC

CVE-2026-83520 · 29 Oct 2026 18:29:26 UTC

CVE-2026-83520 · 28 Oct 2026 19:55:37 UTC

CVE-2026-83520 · 27 Oct 2026 15:46:19 UTC

CVE-2026-83520 · 27 Oct 2026 00:23:05 UTC

CVE-2026-83520 · 25 Oct 2026 15:18:41 UTC

CVE-2026-83520 · 25 Oct 2026 02:24:38 UTC

CVE-2026-83520 · 23 Oct 2026 16:01:26 UTC

Immutable source observations

22 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

7 Nov 2026 15:21:15 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

5 Nov 2026 14:37:05 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

3 Nov 2026 13:59:43 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

1 Nov 2026 12:59:48 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

30 Oct 2026 12:00:42 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

28 Oct 2026 09:46:04 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

euvd · EUVD-2026-100198 · Published

25 Oct 2026 16:19:10 UTC

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

nvd · CVE-2026-83520 · Published

23 Oct 2026 16:01:25 UTC

Microsoft Security Advisory CVE-2026-83520 - .NET and Visual Studio Remote Code Execution Vulnerability

osv · GHSA-4w5f-7jp2-w48g · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 8 Nov 06:21 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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