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
Probability:
Percentile:
Meta Information
Published
2026-04-22
Last Modified
2026-04-23
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-15
NVD
CVE-2025-9957
EUVD
EUVD-2025-209556
Affected Vendors & Products
Showing 6 associated CPEs
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
CWE Icon
KEV
KEV Icon
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 Quick Actions
Instant insights powered by AI
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.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-9957. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart