GitLab Enterprise Edition up to 18.9.6/18.10.5/18.11.2 Merge Request authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in GitLab Enterprise Edition up to 18.9.6/18.10.5/18.11.2. Affected by this issue is some unknown functionality of the component Merge Request Handler. Executing a manipulation can lead to authorization. This vulnerability is handled as CVE-2026-6063. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in GitLab Enterprise Edition up to 18.9.6/18.10.5/18.11.2. This vulnerability affects an unknown functionality of the component Merge Request Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

GitLab has remediated an issue in GitLab EE affecting all versions from 11.10 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user with developer-role permissions to remove code owner approval rules from merge requests due to improper access control.

The weakness was released by pollito. The advisory is available at gitlab.com. This vulnerability was named CVE-2026-6063 since 04/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 314553 (GitLab 11.10 < 18.9.7 / 18.10 < 18.10.6 / 18.11 < 18.11.3 (CVE-2026-6063)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 18.9.7, 18.10.6 or 18.11.3 eliminates this vulnerability. The upgrade is hosted for download at about.gitlab.com.

The vulnerability is also documented in the vulnerability database at Tenable (314553). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Bug Tracking Software

Vendor

• GitLab

Name

• Enterprise Edition

Version

• 18.9.0
• 18.9.1
• 18.9.2
• 18.9.3
• 18.9.4
• 18.9.5
• 18.9.6
• 18.10.0
• 18.10.1
• 18.10.2
• 18.10.3
• 18.10.4
• 18.10.5
• 18.11.0
• 18.11.1
• 18.11.2

License

• commercial

Website

• Vendor: https://gitlab.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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