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CVE-2026-70179ImportantEoPNetworkRevised 15 Oct

ASP.NET Core Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

Severity
Important
CVSS base score
7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Elevation of Privilege
EPSS · 30-day forecast
0.6%FIRST forecast dated 7 Nov 2026, for the following 30 days · FIRST percentile 50.4% · 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
ASP.NET Core
Weakness
CWE-290: Authentication Bypass by Spoofing
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
15 Oct 2026Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. 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
LowPR:L
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Developer Tools, Other
11 affected products
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Windows
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Windows
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Windows

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. Affected products: Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Windows → Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Windows
  9. Publisher revision note: Information published. → Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. 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 (60)

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

  1. 7 Nov 2026 · 16:12:44 UTC EPSS0.6%; scored 6 Nov 2026 → 0.6%; scored 7 Nov 2026
  2. 6 Nov 2026 · 19:15:37 UTC EPSS0.6%; scored 5 Nov 2026 → 0.6%; 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 EPSS0.6%; scored 4 Nov 2026 → 0.6%; scored 5 Nov 2026
  12. 5 Nov 2026 · 02:36:20 UTC EPSS0.6%; scored 3 Nov 2026 → 0.6%; scored 4 Nov 2026
  13. 4 Nov 2026 · 03:04:37 UTC EPSS0.6%; scored 2 Nov 2026 → 0.6%; scored 3 Nov 2026
  14. 3 Nov 2026 · 01:53:36 UTC EPSS0.6%; scored 1 Nov 2026 → 0.6%; 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 EPSS0.6%; scored 31 Oct 2026 → 0.6%; scored 1 Nov 2026
  24. 31 Oct 2026 · 18:22:15 UTC EPSS0.6%; scored 30 Oct 2026 → 0.6%; scored 31 Oct 2026
  25. 30 Oct 2026 · 18:02:45 UTC EPSS0.6%; scored 29 Oct 2026 → 0.6%; 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 EPSS0.6%; scored 28 Oct 2026 → 0.6%; scored 29 Oct 2026
  31. 28 Oct 2026 · 20:00:33 UTC EPSS0.6%; scored 27 Oct 2026 → 0.6%; scored 28 Oct 2026
  32. 27 Oct 2026 · 15:48:13 UTC EPSS0.6%; scored 26 Oct 2026 → 0.6%; scored 27 Oct 2026
  33. 26 Oct 2026 · 23:57:09 UTC EPSS0.6%; scored 25 Oct 2026 → 0.6%; scored 26 Oct 2026
  34. 25 Oct 2026 · 17:12:51 UTC EPSS0.6%; scored 24 Oct 2026 → 0.6%; scored 25 Oct 2026
  35. 25 Oct 2026 · 01:34:18 UTC EPSS0.6%; scored 23 Oct 2026 → 0.6%; scored 24 Oct 2026
  36. 23 Oct 2026 · 15:51:28 UTC EPSS0.6%; scored 22 Oct 2026 → 0.6%; 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 Affected productsMicrosoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Windows → Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 runtime installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 runtime installed on Windows, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Linux, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Mac OS, Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 runtime installed on Windows
  50. 22 Oct 2026 · 17:33:15 UTC EPSS0.6%; scored 21 Oct 2026 → 0.6%; scored 22 Oct 2026
  51. 21 Oct 2026 · 21:47:24 UTC EPSS0.6%; scored 20 Oct 2026 → 0.6%; scored 21 Oct 2026
  52. 20 Oct 2026 · 20:53:31 UTC EPSS0.6%; scored 19 Oct 2026 → 0.6%; scored 20 Oct 2026
  53. 19 Oct 2026 · 15:12:40 UTC EPSS0.6%; scored 18 Oct 2026 → 0.6%; scored 19 Oct 2026
  54. 18 Oct 2026 · 14:54:30 UTC EPSS0.6%; scored 16 Oct 2026 → 0.6%; scored 18 Oct 2026
  55. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  56. 16 Oct 2026 · 16:13:25 UTC EPSS0.6%; scored 15 Oct 2026 → 0.6%; scored 16 Oct 2026
  57. 15 Oct 2026 · 21:30:54 UTC Revision noteInformation published. → Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
  58. 15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
  59. 15 Oct 2026 · 21:30:54 UTC EPSS0.6%; scored 14 Oct 2026 → 0.6%; scored 15 Oct 2026
  60. 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.6%; scored 14 Oct 2026

Explore global source statements, affected packages and advisory history for CVE-2026-70179. 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-2026-70179

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

FIRST EPSS: 0.63 % · percentile 50.41 % · 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-2026-70179 · 07 Nov 2026 16:07:52 UTC

CVE-2026-70179 · 06 Nov 2026 19:10:17 UTC

CVE-2026-70179 · 05 Nov 2026 22:49:22 UTC

CVE-2026-70179 · 05 Nov 2026 02:54:06 UTC

CVE-2026-70179 · 03 Nov 2026 16:59:18 UTC

CVE-2026-70179 · 02 Nov 2026 23:59:04 UTC

CVE-2026-70179 · 01 Nov 2026 23:58:58 UTC

CVE-2026-70179 · 01 Nov 2026 03:04:52 UTC

CVE-2026-70179 · 31 Oct 2026 01:52:30 UTC

CVE-2026-70179 · 29 Oct 2026 18:29:26 UTC

CVE-2026-70179 · 28 Oct 2026 19:55:37 UTC

CVE-2026-70179 · 27 Oct 2026 15:46:19 UTC

CVE-2026-70179 · 27 Oct 2026 00:23:05 UTC

CVE-2026-70179 · 25 Oct 2026 15:18:41 UTC

CVE-2026-70179 · 25 Oct 2026 02:24:38 UTC

CVE-2026-70179 · 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 14:22:02 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

5 Nov 2026 13:37:57 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

3 Nov 2026 13:00:59 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

1 Nov 2026 11:33:38 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

30 Oct 2026 11:01:22 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

28 Oct 2026 08:47:10 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

euvd · EUVD-2026-99696 · Published

25 Oct 2026 15:18:57 UTC

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

nvd · CVE-2026-70179 · Published

23 Oct 2026 16:01:25 UTC

Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability

osv · GHSA-vrrp-6v32-2p8g · 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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