# CVE-2025-12734: Improper Encoding or Escaping of Output in GitLab

> CVE-2025-12734: Improper Encoding or Escaping of Output in GitLab. CVSS 3.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-12734
Last updated: 2026-10-14T21:10:00Z

- Published: 2025-12-11 07:32 UTC · Updated: 2026-10-14 21:10 UTC · Assigner: GitLab
- CVSS: 3.5 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
- EPSS: 0.27%, 19th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-116

## 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.

## Affected vendors and products

- GitLab: GitLab

## Tracked companies

- [GitLab](https://rewindex.com/company/gitlab.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-12734)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-12734)
- [https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/](https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/)
- [https://gitlab.com/gitlab-org/gitlab/-/issues/579573](https://gitlab.com/gitlab-org/gitlab/-/issues/579573)
- [https://hackerone.com/reports/3379381](https://hackerone.com/reports/3379381)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-12734 · Markdown: https://rewindex.com/cve/CVE-2025-12734.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-12734 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:28.474Z