CVE-2025-12653
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-26

Last updated on: 2025-12-10

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.
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Meta Information
Published
2025-11-26
Last Modified
2025-12-10
Generated
2026-06-16
AI Q&A
2025-11-26
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12653
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 18.3.0 (inc) to 18.4.5 (exc)
gitlab gitlab From 18.3.0 (inc) to 18.4.5 (exc)
gitlab gitlab From 18.5.0 (inc) to 18.5.3 (exc)
gitlab gitlab From 18.5.0 (inc) to 18.5.3 (exc)
gitlab gitlab 18.6.0
gitlab gitlab 18.6.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-290 This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
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Executive Summary

This vulnerability in GitLab CE/EE versions before certain fixed releases allowed an unauthenticated user to join arbitrary organizations by manipulating request headers under specific conditions.

Impact Analysis

An attacker could exploit this vulnerability to join organizations without authorization, potentially gaining access to resources or information intended only for legitimate members, which could lead to information disclosure or unauthorized actions.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version: 18.4.5 or later if you are on 18.3 series, 18.5.3 or later if on 18.5 series, or 18.6.1 or later if on 18.6 series. This will prevent unauthenticated users from joining arbitrary organizations by manipulating request headers.

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