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CVE-2026-66822ImportantInformation DisclosureNetworkRevised 15 Oct

.NET Information Disclosure Vulnerability

MSRC advisory NVD CVE.org

Assessment

Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network.

Severity
Important
CVSS base score
5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Impact
Information Disclosure
EPSS · 30-day forecast
0.8%FIRST forecast dated 7 Nov 2026, for the following 30 days · FIRST percentile 56.3% · 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-201: Insertion of Sensitive Information Into Sent Data
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
15 Oct 2026Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
NoneI:N
Availability
NoneA:N

Updates that fix it

3 KBs
KBTypeApplies toOther CVEs
KB5130034 Security Update.NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on WindowsAll CVEs in KB5130034
KB5130035 Security Update.NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on WindowsAll CVEs in KB5130035
KB5130036 Security Update.NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on WindowsAll CVEs in KB5130036

Affected products

Developer Tools
14 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: KB5130034: .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows; KB5130035: .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows; KB5130036: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows → KB5130034: .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows · Affected products: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Linux, .NET 11.0 runtime installed on Mac OS, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
  9. Publisher revision note: Information published. → Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
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 (61)

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

  1. 7 Nov 2026 · 16:12:44 UTC EPSS0.8%; scored 6 Nov 2026 → 0.8%; scored 7 Nov 2026
  2. 6 Nov 2026 · 19:15:37 UTC EPSS0.8%; scored 5 Nov 2026 → 0.8%; 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 EPSS0.8%; scored 4 Nov 2026 → 0.8%; scored 5 Nov 2026
  12. 5 Nov 2026 · 02:36:20 UTC EPSS0.8%; scored 3 Nov 2026 → 0.8%; scored 4 Nov 2026
  13. 4 Nov 2026 · 03:04:37 UTC EPSS0.8%; scored 2 Nov 2026 → 0.8%; scored 3 Nov 2026
  14. 3 Nov 2026 · 01:53:36 UTC EPSS0.8%; scored 1 Nov 2026 → 0.8%; 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 EPSS0.8%; scored 31 Oct 2026 → 0.8%; scored 1 Nov 2026
  24. 31 Oct 2026 · 18:22:15 UTC EPSS0.8%; scored 30 Oct 2026 → 0.8%; scored 31 Oct 2026
  25. 30 Oct 2026 · 18:02:45 UTC EPSS0.8%; scored 29 Oct 2026 → 0.8%; 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 EPSS0.8%; scored 28 Oct 2026 → 0.8%; scored 29 Oct 2026
  31. 28 Oct 2026 · 20:00:33 UTC EPSS0.8%; scored 27 Oct 2026 → 0.8%; scored 28 Oct 2026
  32. 27 Oct 2026 · 15:48:13 UTC EPSS0.8%; scored 26 Oct 2026 → 0.8%; scored 27 Oct 2026
  33. 26 Oct 2026 · 23:57:09 UTC EPSS0.8%; scored 25 Oct 2026 → 0.8%; scored 26 Oct 2026
  34. 25 Oct 2026 · 17:12:51 UTC EPSS0.7%; scored 24 Oct 2026 → 0.8%; scored 25 Oct 2026
  35. 25 Oct 2026 · 01:34:18 UTC EPSS0.7%; scored 23 Oct 2026 → 0.7%; scored 24 Oct 2026
  36. 23 Oct 2026 · 15:51:28 UTC EPSS0.7%; scored 22 Oct 2026 → 0.7%; 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 itKB5130034: .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows; KB5130035: .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows; KB5130036: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows → KB5130034: .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows; KB5130035: .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows; KB5130036: .NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows
  50. 22 Oct 2026 · 22:02:57 UTC Affected products.NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10 → .NET 10.0 runtime installed on Linux, .NET 10.0 runtime installed on Mac OS, .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Linux, .NET 11.0 runtime installed on Mac OS, .NET 11.0 runtime installed on Windows, .NET 8.0 runtime installed on Linux, .NET 8.0 runtime installed on Mac OS, .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Linux, .NET 9.0 runtime installed on Mac OS, .NET 9.0 runtime installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
  51. 22 Oct 2026 · 17:33:15 UTC EPSS0.7%; scored 21 Oct 2026 → 0.7%; scored 22 Oct 2026
  52. 21 Oct 2026 · 21:47:24 UTC EPSS0.7%; scored 20 Oct 2026 → 0.7%; scored 21 Oct 2026
  53. 20 Oct 2026 · 20:53:31 UTC EPSS0.7%; scored 19 Oct 2026 → 0.7%; scored 20 Oct 2026
  54. 19 Oct 2026 · 15:12:40 UTC EPSS0.7%; scored 18 Oct 2026 → 0.7%; scored 19 Oct 2026
  55. 18 Oct 2026 · 14:54:30 UTC EPSS0.7%; scored 16 Oct 2026 → 0.7%; 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 EPSS0.7%; scored 15 Oct 2026 → 0.7%; scored 16 Oct 2026
  58. 15 Oct 2026 · 21:30:54 UTC Revision noteInformation published. → Updated the Security Updates table to add KB article links for .NET 11.0. This is an informational change only; the fixed builds are unchanged.
  59. 15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  60. 15 Oct 2026 · 21:30:54 UTC EPSS0.7%; scored 14 Oct 2026 → 0.7%; scored 15 Oct 2026
  61. 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.7%; scored 14 Oct 2026

Explore global source statements, affected packages and advisory history for CVE-2026-66822. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-66822 · Microsoft / collected KEV context

EUVD-2026-99277

GHSA-wxxw-5cvc-53j7

cve-program · CVE-2026-66822

euvd · EUVD-2026-99277

nvd · CVE-2026-66822

osv · GHSA-wxxw-5cvc-53j7

Related operational evidence

Explicit CVE identifiers
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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