CVE-2026-5845
Description
An improper authorization vulnerability in scoped user-to-server (ghu_) token authorization in GitHub Enterprise Server allows an authenticated attacker to access private repositories outside the intended installation scope, which can include write operations, via an authorization fallback that treated a revoked/deleted installation as a global installation context, which could be chained with token revocation timing and SSH push attribution to obtain and reuse a victim-scoped token. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.
Affected products
2cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*range: <3.14.26
- cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- docs.github.com/en/enterprise-server@3.14/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.15/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.16/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.17/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.18/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.19/admin/release-notesnvdRelease NotesVendor Advisory
- docs.github.com/en/enterprise-server@3.20/admin/release-notesnvdRelease NotesVendor Advisory
News mentions
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