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CVE-2025-12734— Improper Encoding or Escaping of Output 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 Enterprise Edition（EE）和GitLab Community Edition（CE） 18.4.6之前版本、18.5版本至18.5.4之前版本和18.6版本至18.6.2之前版本存

CVSS 3.5 · Low EPSS 0.26% · P18
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I. Basic Information for CVE-2025-12734

Vulnerability Information
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Vulnerability Title
Improper Encoding or Escaping of Output in GitLab
Source: CVE Program / CVE List V5
Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to, under certain conditions, render content in dialogs to other users by injecting malicious HTML content into merge request titles.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GitLab Enterprise Edition（EE）和GitLab Community Edition（CE） 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 Enterprise Edition（EE）和GitLab Community Edition（CE） 18.4.6之前版本、18.5版本至18.5.4之前版本和18.6版本至18.6.2之前版本存
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 15.6 ~ 18.4.6 cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-12734

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III. Intelligence Information for CVE-2025-12734

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Patches & Fixes for CVE-2025-12734 (1)

Other References for CVE-2025-12734 (2)

Same Patch Batch · GitLab · 2025-12-11 · 10 CVEs total

CVE-2025-12716 8.7 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2025-12029 8.0 HIGH Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gi
CVE-2025-8405 7.7 HIGH Improper Encoding or Escaping of Output in GitLab
CVE-2025-12562 7.5 HIGH Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-11984 6.8 MEDIUM Authentication Bypass Using an Alternate Path or Channel in GitLab
CVE-2025-14157 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-4097 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in GitLab
CVE-2025-13978 4.3 MEDIUM Generation of Error Message Containing Sensitive Information in GitLab
CVE-2025-11247 4.3 MEDIUM Authorization Bypass Through User-Controlled Key in GitLab

IV. Related Vulnerabilities

Same product: GitLab
Same vendor: GitLab
Same weakness: CWE-116

V. Comments for CVE-2025-12734

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