CVE-2025-8405

HIGH 7.7

Improper Encoding or Escaping of Output in GitLab

CVSS Score

7.7

EPSS Score

0.0%

EPSS Percentile

0th

GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 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 perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.

CWE	CWE-116
Vendor	gitlab
Product	gitlab
Ecosystems	DevTools
Industries	Technology
Published	Dec 11, 2025
Last Updated	Feb 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

GitLab / GitLab

17.1 < 18.4.6 18.5 < 18.5.4 18.6 < 18.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/issues/558214 hackerone.com: https://hackerone.com/reports/3270940 about.gitlab.com: https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/

Credits

Thanks [yvvdwf](https://hackerone.com/yvvdwf) for reporting this vulnerability through our HackerOne bug bounty program