CVE-2026-3306 Missing authorization in Enterprise Server

Medium 5.3 Published 10 Mar 2026 Updated 11 Mar 2026

Users with project write access can modify issue and pull request metadata without repository write permissions, requiring a patch.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-3306?

CVE-2026-3306 is a medium-severity missing authorization vulnerability in Github Enterprise Server, published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-639

Which versions are affected by CVE-2026-3306?

It affects 1 product.

Products include Github Enterprise Server.

How do I fix CVE-2026-3306?

No fix has been published for CVE-2026-3306 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-3306 being exploited?

There is no known exploitation of CVE-2026-3306 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

All Github Enterprise Server vulnerabilities

Sources

Also known as GHSA-9ggx-qhc4-9pww.