CVE-2026-5512

Vulnerability Description

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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

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