CVE-2026-2973

EUVD-2026-15809
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to execute arbitrary JavaScript in a user's browser due to improper sanitization of entity-encoded content in Mermaid diagrams.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
GitLabCNA
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
17.7.0 ≤
𝑥
< 18.8.7
gitlabgitlab
17.7.0 ≤
𝑥
< 18.8.7
gitlabgitlab
18.9.0 ≤
𝑥
< 18.9.3
gitlabgitlab
18.9.0 ≤
𝑥
< 18.9.3
gitlabgitlab
18.10.0
gitlabgitlab
18.10.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/591049
https://hackerone.com/reports/3566802