---
id: CVE-2025-12734
title: >-
  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
  dialo…
summary: >-
  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
  dialo…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-116
vendor: gitlab
product: gitlab
affected:
  - 'gitlab >= 15.6.0, < 18.4.6'
  - 'gitlab >= 18.5.0, < 18.5.4'
  - 'gitlab >= 18.6.0, < 18.6.2'
patched:
  - gitlab 18.6.2
published: '2025-12-11'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:10:00.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-12734'
references:
  - url: >-
      https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/
    label: cve@gitlab.com
  - url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/579573'
    label: cve@gitlab.com
  - url: 'https://hackerone.com/reports/3379381'
    label: cve@gitlab.com
tags:
  - nvd
epss: 0.00269
epssPercentile: 0.17782
ingestedAt: '2026-10-14T21:57:04.798Z'
---

## Overview

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.

## Affected

- `gitlab >= 15.6.0, < 18.4.6`
- `gitlab >= 18.5.0, < 18.5.4`
- `gitlab >= 18.6.0, < 18.6.2`

## Remediation

Upgrade past the affected range:

- `gitlab 18.6.2`