{"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":"2026-10-13","sourceUpdated":"2026-10-13T21:18:04.770","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"}],"tags":["nvd","ghsa","nuget"],"aliases":["GHSA-vrrp-6v32-2p8g"],"ecosystem":"nuget","ingestedAt":"2026-10-13T19:43:29.020Z","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","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}