An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. 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.
Fix
Patch, vendor advisory and mitigation references on NVD 7
- https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.15.21 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.16.17 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.14 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.8 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.5 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1 Release Notes, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.3 · githubNVD modified 2026-10-26 21:10
Affected (CPE criteria) 2
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*
References 7
- https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.15.21 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.16.17 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.14 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.8 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.5 Release Notes, Vendor Advisory
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1 Release Notes, Vendor Advisory