CVE-2026-2726
Improper Access Control in GitLab Merge Requests Allows Unauthorized Actions
Publication date: 2026-03-25
Last updated on: 2026-03-26
Assigner: GitLab Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| gitlab | gitlab | From 18.9.0 (inc) to 18.9.3 (exc) |
| gitlab | gitlab | 18.10.0 |
| gitlab | gitlab | From 18.9.0 (inc) to 18.9.3 (exc) |
| gitlab | gitlab | 18.10.0 |
| gitlab | gitlab | From 11.10.0 (inc) to 18.8.7 (exc) |
| gitlab | gitlab | From 11.10.0 (inc) to 18.8.7 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in GitLab CE/EE affects versions from 11.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1. It allows an authenticated user to perform unauthorized actions on merge requests in other projects. The root cause is improper access control during cross-repository operations.
How can this vulnerability impact me? :
The vulnerability can impact you by allowing an authenticated user to perform unauthorized actions on merge requests in projects they should not have access to. This could lead to unauthorized changes or manipulations in code repositories, potentially affecting the integrity of your projects.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version. Specifically, update to version 18.8.7 or later if you are using the 18.8 series, 18.9.3 or later if using the 18.9 series, or 18.10.1 or later if using the 18.10 series.
This vulnerability affects all versions from 11.10 before the fixed versions mentioned above, and it allows an authenticated user to perform unauthorized actions on merge requests in other projects due to improper access control during cross-repository operations.