Recorded 15 Oct 2026 at 21:30 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.

CVEMicrosoft Security Response Center

ASP.NET Core Elevation of Privilege Vulnerability

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

What it said

CVE: CVE-2026-70179
Severity: Important
CVSS base score: 7.5
CVSS vector: CVSS: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
Exploitation detected: Not reported by MSRC
Publicly disclosed: No
Exploitability: Exploitation Less Likely
Component: ASP.NET Core
Weakness: CWE-290: Authentication Bypass by Spoofing
Issued by: Microsoft
Customer action: Required: apply the update
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
Updates that fix it: No KB listed
CISA KEV: Not listed in the collected catalog
EPSS: 0.6%; scored 15 Oct 2026
Public exploit code: No Nuclei template listed
Published: 13 Oct 2026 07:00 UTC
Last revised: 15 Oct 2026 07:00 UTC
Revision note: 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.

Recorded links

Source evidence when recorded

Microsoft security releases: Complete at observationRead 15 Oct 2026 at 21:30 UTC
CISA KEV: Complete at observationRead 15 Oct 2026 at 21:30 UTC
FIRST EPSS: Complete at observationRead 15 Oct 2026 at 21:30 UTC
Public detection templates (Nuclei): Complete at observationRead 15 Oct 2026 at 21:30 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

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.
15 Oct 2026

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 (4)

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

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.
15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
15 Oct 2026 · 21:30:54 UTC EPSS0.6%; scored 14 Oct 2026 → 0.6%; scored 15 Oct 2026
15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.6%; scored 14 Oct 2026