CVE-2026-3307

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.

• CWE-639

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

Published

Apr 21, 2026

Last Modified

Jun 17, 2026

Status

Analyzed