CVE-2025-9957

Received Received - Intake

Authorization Bypass in GitLab CE/EE Allows Fork Prevention Bypass

Publication date: 2026-04-22

Last updated on: 2026-04-23

Assigner: GitLab Inc.

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.2 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user with project owner permissions to bypass group fork prevention settings due to improper authorization checks.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-22

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2025-9957

EUVD

EUVD-2025-209556

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab	From 18.10.0 (inc) to 18.10.4 (exc)
gitlab	gitlab	From 18.10.0 (inc) to 18.10.4 (exc)
gitlab	gitlab	From 11.2.0 (inc) to 18.9.6 (exc)
gitlab	gitlab	From 11.2.0 (inc) to 18.9.6 (exc)
gitlab	gitlab	18.11.0
gitlab	gitlab	18.11.0

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 11.2 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1. Under certain conditions, it could allow an authenticated user with project owner permissions to bypass group fork prevention settings due to improper authorization checks.

Impact Analysis

The vulnerability allows a project owner to bypass group fork prevention settings, which could lead to unauthorized forking of projects within a group. This may result in unintended code duplication or exposure of project code to unauthorized forks, potentially impacting project confidentiality and control.

Mitigation Strategies

To mitigate this vulnerability, update GitLab CE/EE to a fixed version. Specifically, upgrade to version 18.9.6 or later if using the 18.9 series, 18.10.4 or later if using the 18.10 series, or 18.11.1 or later if using the 18.11 series. These versions contain the fix for the improper authorization checks that allowed bypassing group fork prevention settings.

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