{"id":"CVE-2026-70179","title":"Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.","summary":"Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-290"],"vendor":"Microsoft","product":"Microsoft.AspNetCore.Authentication.Negotiate","affected":["Microsoft.AspNetCore.Authentication.Negotiate >= 10.0.0, <= 10.0.12","Microsoft.AspNetCore.Authentication.Negotiate >= 8.0.0, <= 8.0.31","Microsoft.AspNetCore.Authentication.Negotiate >= 9.0.0, <= 9.0.20"],"patched":["Microsoft.AspNetCore.Authentication.Negotiate 10.0.13","Microsoft.AspNetCore.Authentication.Negotiate 8.0.32","Microsoft.AspNetCore.Authentication.Negotiate 9.0.21"],"published":"2026-10-13","updated":"2026-10-14","sourceUpdated":"2026-10-14T04:18:32.693","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70179","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70179","label":"secure@microsoft.com"},{"url":"https://github.com/dotnet/aspnetcore/security/advisories/GHSA-vrrp-6v32-2p8g"},{"url":"https://github.com/dotnet/announcements/issues/458"},{"url":"https://github.com/dotnet/aspnetcore/discussions/69794"},{"url":"https://github.com/advisories/GHSA-vrrp-6v32-2p8g"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70179"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-70179.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-70179"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2548790"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-70179"},{"url":"https://access.redhat.com/errata/RHSA-2026:86195"},{"url":"https://access.redhat.com/errata/RHSA-2026:86168"},{"url":"https://access.redhat.com/errata/RHSA-2026:86172"},{"url":"https://access.redhat.com/errata/RHSA-2026:86192"},{"url":"https://access.redhat.com/errata/RHSA-2026:86594"},{"url":"https://access.redhat.com/errata/RHSA-2026:86170"},{"url":"https://access.redhat.com/errata/RHSA-2026:86193"},{"url":"https://access.redhat.com/errata/RHSA-2026:86169"},{"url":"https://access.redhat.com/errata/RHSA-2026:86171"},{"url":"https://access.redhat.com/errata/RHSA-2026:88474"},{"url":"https://access.redhat.com/errata/RHSA-2026:88424"},{"url":"https://access.redhat.com/errata/RHSA-2026:88425"},{"url":"https://access.redhat.com/errata/RHSA-2026:88422"}],"tags":["nvd","ghsa","nuget","cve.org","csaf","vex","red-hat"],"aliases":["GHSA-vrrp-6v32-2p8g"],"ecosystem":"nuget","ingestedAt":"2026-10-13T19:43:29.020Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-08T00:00:00+00:00"},"epss":0.00629,"epssPercentile":0.49949,"slug":"CVE-2026-70179","body":"## Overview\n\nAuthentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-70179)\n\nAffected packages:\n\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 10.0.0, <= 10.0.12`\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 8.0.0, <= 8.0.31`\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 9.0.0, <= 9.0.20`\n\nPatched in:\n\n- `Microsoft.AspNetCore.Authentication.Negotiate 10.0.13`\n- `Microsoft.AspNetCore.Authentication.Negotiate 8.0.32`\n- `Microsoft.AspNetCore.Authentication.Negotiate 9.0.21`\n\nSource: https://github.com/advisories/GHSA-vrrp-6v32-2p8g\n\n## Vendor advisories\n\n- **RHSA-2026:86195** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86195)\n- **RHSA-2026:86168** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86168)\n- **RHSA-2026:86172** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86172)\n- **RHSA-2026:86192** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86192)\n- **RHSA-2026:86594** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86594)\n- **RHSA-2026:86170** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86170)\n- **RHSA-2026:86193** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86193)\n- **RHSA-2026:86169** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86169)\n- **RHSA-2026:86171** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86171)\n- **RHSA-2026:88474** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88474)\n- **RHSA-2026:88424** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88424)\n- **RHSA-2026:88425** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88425)\n- **RHSA-2026:88422** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88422)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}