CVE-2026-2726
Received Received - Intake
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
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to perform unauthorized actions on merge requests in other projects due to improper access control during cross-repository operations.
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Meta Information
Published
2026-03-25
Last Modified
2026-03-26
Generated
2026-06-16
AI Q&A
2026-03-25
EPSS Evaluated
2026-06-15
NVD
CVE-2026-2726
EUVD
EUVD-2026-15803
Affected Vendors & Products
Showing 6 associated CPEs
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
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

Mitigation Strategies

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.

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