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CVE-2025-12653

Good to know:

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Date: November 26, 2025

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.

Severity Score

Related Resources (4)

https://nvd.nist.gov/vuln/detail/CVE-2025-12653
https://gitlab.com/gitlab-org/gitlab/-/issues/579372
https://hackerone.com/reports/3370245
https://www.mend.io/vulnerability-database/CVE-2025-12653

Severity Score

Weakness Type (CWE)

Authentication Bypass by Spoofing

CWE-290

Top Fix

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Upgrade Version

Upgrade to version https://gitlab.com/gitlab-org/gitlab.git - v18.4.5-ee;https://gitlab.com/gitlab-org/gitlab.git - v18.5.3-ee;https://gitlab.com/gitlab-org/gitlab.git - v18.6.1-ee

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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