CVE-2026-75101Authorization bypass vulnerability in GitHub Enterprise Server allowed reading of private pull request diffs and patches via repository name collision
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.0 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_P
- NVD analysis
- Analyzed
- Record last updated
- Sep 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GitHub Enterprise Server github:enterprise_server (from the name) | from 3.17.0 before 3.17.*; fixed at 3.17.21; from 3.18.0 before 3.18.*; fixed at 3.18.15; from 3.19.0 before 3.19.*; fixed at 3.19.12; from 3.20.0 before 3.20.*; fixed at 3.20.8; from 3.21.0 before 3.21.*; fixed at 3.21.6 | CNA record |
github enterprise_server github:enterprise_server | from 3.17.0 before 3.17.21; from 3.18.0 before 3.18.15; from 3.19.0 before 3.19.12; from 3.20.0 before 3.20.8; from 3.21.0 before 3.21.6 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.21release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.15release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.12release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.8release-notes, vendor-advisory
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.6release-notes, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.