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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-11

Last Modified

2025-12-17

Generated

2026-07-07

AI Q&A

2025-12-11

EPSS Evaluated

2026-07-05

NVD

CVE-2025-12734

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab	18.4.6
gitlab	gitlab	18.5.4
gitlab	gitlab	18.6.2

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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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