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CVE-2025-12653— Authentication Bypass by Spoofing in GitLab

Quick assessment

Affected
GitLab GitLab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitLab Enterprise Edition（EE）和GitLab Community Edition（CE）都是美国GitLab公司的产品。GitLab Enterprise Edition是一套内容管理系统。GitLab Community Edition是一种社区版 GitLab 。 GitLab CE/EE 18.3版本至18.4.5之前版本、18.5版本至18.5.3之前版本和18.6版本至18.6.1之前版本存在安全漏洞，该漏洞源于特定条件下未经验证用户可通过更改请求标头加入任意组织。

CVSS 6.5 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2025-12653

Vulnerability Information
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Vulnerability Title
Authentication Bypass by Spoofing in GitLab
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab CE/EE 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitLab Enterprise Edition（EE）和GitLab Community Edition（CE）都是美国GitLab公司的产品。GitLab Enterprise Edition是一套内容管理系统。GitLab Community Edition是一种社区版 GitLab 。 GitLab CE/EE 18.3版本至18.4.5之前版本、18.5版本至18.5.3之前版本和18.6版本至18.6.1之前版本存在安全漏洞，该漏洞源于特定条件下未经验证用户可通过更改请求标头加入任意组织。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitLab GitLab 18.3 ~ 18.4.5 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-12653

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III. Intelligence Information for CVE-2025-12653

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Patches & Fixes for CVE-2025-12653 (1)

Same Patch Batch · GitLab · 2025-11-26 · 5 CVEs total

CVE-2025-12571 7.5 HIGH Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-7449 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-6195 4.3 MEDIUM Direct Request ('Forced Browsing') in GitLab
CVE-2025-13611 2.0 LOW Insertion of Sensitive Information into Log File in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-290

V. Comments for CVE-2025-12653

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