CVE-2026-3306
Received Received - Intake
Improper Authorization in GitHub Enterprise Server Allows Metadata Modification

Publication date: 2026-03-10

Last updated on: 2026-03-12

Assigner: GitHub, Inc. (Products Only)

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.
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Meta Information
Published
2026-03-10
Last Modified
2026-03-12
Generated
2026-06-16
AI Q&A
2026-03-10
EPSS Evaluated
2026-06-14
NVD
CVE-2026-3306
EUVD
EUVD-2026-10742
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
github enterprise_server From 3.17.0 (inc) to 3.17.12 (exc)
github enterprise_server From 3.18.0 (inc) to 3.18.6 (exc)
github enterprise_server From 3.19.0 (inc) to 3.19.3 (exc)
github enterprise_server to 3.14.24 (exc)
github enterprise_server From 3.15.0 (inc) to 3.15.19 (exc)
github enterprise_server From 3.16.0 (inc) to 3.16.15 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 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.
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Executive Summary

This vulnerability is an improper authorization issue in GitHub Enterprise Server. It allows a user who has read access to a repository and write access to a project to modify issue and pull request metadata through the project. Specifically, when adding an item to a project that already exists, the system updates column values without verifying if the user has write permissions on the repository.

Impact Analysis

The vulnerability can allow users with limited permissions to modify metadata of issues and pull requests in repositories where they should not have write access. This could lead to unauthorized changes in project tracking and management data, potentially causing confusion, mismanagement, or manipulation of project workflows.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade your GitHub Enterprise Server to one of the fixed versions: 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6, or 3.19.3.

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