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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-03-25

Last Modified

2026-03-26

Generated

2026-07-06

AI Q&A

2026-03-25

EPSS Evaluated

2026-07-05

NVD

CVE-2026-2726

EUVD

EUVD-2026-15803

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

KEV

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

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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