CVE-2026-3307

Summary

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.25Advisory
• https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.20Advisory
• https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.16Advisory
• https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.13Advisory
• https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.7Advisory
• https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.4Advisory
• https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1Advisory