CVE-2026-3254

EUVD-2026-24961
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitLabCNA
3.5 LOW
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
gitlabgitlab
18.11 ≤
𝑥
< 18.11.1
CNA
Debian logo
Debian Releases
Debian Product
Codename
gitlab
sid
17.6.5-19
fixed
Common Weakness Enumeration
References
https://gitlab.com/gitlab-org/gitlab/-/work_items/591587
https://hackerone.com/reports/3572752