PT-2026-27991 · Gitlab · Gitlab Ce/Ee

Published 2026-03-25 · Updated 2026-03-27 · CVE-2026-2973

Positive Technologies (AI Summary)

CVSS v2.0

5.5

Medium

Base vector

AV:N/AC:L/Au:S/C:P/I:P/A:N

Name of the Vulnerable Software and Affected Versions GitLab CE/EE versions 17.7 through 18.8.6 GitLab CE/EE versions 18.9 through 18.9.2 GitLab CE/EE versions 18.10 through 18.10.0

Description An authenticated user could execute arbitrary JavaScript in a user's browser. This is due to improper sanitization of entity-encoded content within Mermaid diagrams.

Recommendations Update GitLab CE/EE to version 18.8.7 or later. Update GitLab CE/EE to version 18.9.3 or later. Update GitLab CE/EE to version 18.10.1 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2026-06381

BIT-GITLAB-2026-2973

CVE-2026-2973

Affected Products

Gitlab Ce/Ee

References · 8

• 🔥 https://hackerone.com/reports/3566802 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-2973 · Security Note
• https://osv.dev/vulnerability/BIT-gitlab-2026-2973 · Vendor Advisory
• https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06381 · Security Note
• https://twitter.com/CVEnew/status/2036911841029562559 · Twitter Post
• https://gitlab.com/gitlab-org/gitlab/-/work_items/591049 · Note
• https://docs.gitlab.com/releases/patches/patch-release-gitlab-18-10-1-released · Note