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CVE-2026-5845

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.20.1
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • GitHub Enterprise Server

    From 3.20.0 · fixed in 3.20.1; From 3.19.0 · through 3.19.4; From 3.18.0 · through 3.18.7; From 3.17.0 · through 3.17.13; From 3.16.0 · through 3.16.16; From 3.15.0 · through 3.15.20; From 3.14.0 · through 3.14.25

References 7

docs.github.com