CVE-2025-12734
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-11

Last updated on: 2025-12-17

Assigner: GitLab Inc.

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.
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Meta Information
Published
2025-12-11
Last Modified
2025-12-17
Generated
2026-06-16
AI Q&A
2025-12-11
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12734
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
gitlab gitlab 18.4.6
gitlab gitlab 18.5.4
gitlab gitlab 18.6.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-116 The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
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Executive Summary

This vulnerability in GitLab CE/EE affects versions from 15.6 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2. It allows an authenticated user to leak sensitive information by using specifically crafted merge request titles.

Impact Analysis

The vulnerability can lead to information disclosure, where an authenticated user could leak sensitive information from merge request titles. This could expose confidential data to unauthorized users, potentially compromising project privacy and security.

Mitigation Strategies

To mitigate this vulnerability, you should immediately upgrade your GitLab instance to one of the patched versions: 18.4.6, 18.5.4, or 18.6.2, depending on your current version. These patch releases address the information disclosure issue related to specially crafted merge request titles. [1]

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