Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that under certain circumstances, could have allowed an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox UI.
References (3)
Core 3
Core References
Issue Tracking issue-tracking
permissions-required
https://gitlab.com/gitlab-org/gitlab/-/issues/585371
Third Party Advisory technical-description
exploit
permissions-required
https://hackerone.com/reports/3473276
Scores
CVSS v3
8.0
EPSS
0.0010
EPSS Percentile
26.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-79
Status
published
Products (2)
gitlab/gitlab
18.9.0 (2 CPE variants)
gitlab/gitlab
16.2.0 - 18.7.5 (2 CPE variants)
Published
Feb 25, 2026
Tracked Since
Feb 26, 2026