CVE-2026-5845

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.

The following products are affected by CVE-2026-5845 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-5845.

URL	Resource
https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26
https://docs.github.com/en/[email protected]/admin/release-notes#3.15.21
https://docs.github.com/en/[email protected]/admin/release-notes#3.16.17
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.14
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.8
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.5
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1