Improper Auth in GHES: Read-Write Gap in IMD via Project (Fixed 3.14.24+)
CVE-2026-3306 Published on March 10, 2026
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.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2026-3306 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2026-3306
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Affected Versions
GitHub Enterprise Server:- Version 3.14.0, <= 3.14.23 is affected.
- Version 3.15.0, <= 3.15.18 is affected.
- Version 3.16.0, <= 3.16.14 is affected.
- Version 3.17.0, <= 3.17.11 is affected.
- Version 3.18.0, <= 3.18.5 is affected.
- Version 3.19.0, <= 3.19.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.