High severity · published Dec 11, 2025
CVE-2025-8405
Improper Encoding or Escaping of Output in GitLab
7.7
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
17.1 before 18.4.6; 18.5 before 18.5.4; 18.6 before 18.6.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-8405
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-8405
Release Notes
https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/issues/558214
Permissions Required
https://hackerone.com/reports/3270940
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