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CVE PROGRAM SOURCE RECORD7.2 High

CVE-2026-5845

Improper authorization fallback allows scoped user-to-server token installation escape in GitHub Enterprise Server

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Status
Published
Published
Updated
Assigning organization
GitHub_P

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

GitHub Enterprise Server

Default version status: unaffected

  • 3.20.0 to < 3.20.1affected
  • 3.19.0 to ≤ 3.19.4affected
  • 3.18.0 to ≤ 3.18.7affected
  • 3.17.0 to ≤ 3.17.13affected
  • 3.16.0 to ≤ 3.16.16affected
  • 3.15.0 to ≤ 3.15.20affected
  • 3.14.0 to ≤ 3.14.25affected

References