CVE-2026-75101: GitHub Enterprise Server

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed any authenticated user of the instance to read the raw diff or patch of pull requests in private repositories without authorization. Access tokens for raw pull request diffs and patches were scoped to the repository name and pull request number rather than to a globally unique repository identifier, so an attacker who created a repository and pull request matching a target's repository name and pull request number could use a token for their own repository to retrieve the private pull request's contents. Exploitation required the attacker to know the target repository's name and a valid pull request number. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: from 3.17.0, before 3.17.21 (fixed in 3.17.21); from 3.18.0, before 3.18.15 (fixed in 3.18.15); from 3.19.0, before 3.19.12 (fixed in 3.19.12); from 3.20.0, before 3.20.8 (fixed in 3.20.8); from 3.21.0, before 3.21.6 (fixed in 3.21.6)

Published 2026-09-22. Last modified 2026-10-02.