CVE-2021-22242

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 63.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-25 · updated 2026-06-17
Weakness: CWE-79

Description

Insufficient input sanitization in Mermaid markdown in GitLab CE/EE version 11.4 and up allows an attacker to exploit a stored cross-site scripting vulnerability via a specially-crafted markdown

Affected products

GitLab: from 11.4.0 before 13.12.9; from 14.0.0 before 14.0.7; from 14.1.0 before 14.1.2 — fixed in 13.12.9, 14.0.7, 14.1.2

How to fix

Upgrade to a fixed version: GitLab 13.12.9, 14.0.7, 14.1.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22242.json
https://gitlab.com/gitlab-org/gitlab/-/issues/332528
https://hackerone.com/reports/1212822
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22242.json
https://gitlab.com/gitlab-org/gitlab/-/issues/332528
https://hackerone.com/reports/1212822

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