CVE-2026-3306: Improper authorization in GitHub Projects allows modification of issue and pull request metadata without repository write access
An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed a user with read access to a repository and write access to a project to modify issue and pull request metadata through the project. When adding an item to a project that already existed, column value updates were applied without verifying the actor's repository write permissions. This vulnerability was reported via the GitHub Bug Bounty program and has been fixed in GitHub Enterprise Server versions 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6 and 3.19.3.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-3306?
CVE-2026-3306 is considered a high severity vulnerability due to its potential impact on unauthorized access to issue and pull request metadata.
How do I fix CVE-2026-3306?
To fix CVE-2026-3306, upgrade your GitHub Enterprise Server to a version that is not vulnerable, specifically to versions after 3.19.3.
What versions are affected by CVE-2026-3306?
CVE-2026-3306 affects GitHub Enterprise Server versions up to 3.14.24 and various versions between 3.15.0 and 3.19.0.
What are the consequences of exploiting CVE-2026-3306?
Exploiting CVE-2026-3306 could allow a user with read access to modify issue and pull request metadata, compromising the integrity of project management.
Who can exploit CVE-2026-3306?
A user with read access to a repository and write access to a project can exploit CVE-2026-3306.