CVE-2020-13262

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-19 · updated 2026-06-17
Weakness: CWE-74

Description

Client-Side code injection through Mermaid markup in GitLab CE/EE 12.9 and later through 13.0.1 allows a specially crafted Mermaid payload to PUT requests on behalf of other users via clicking on a link

Affected products

GitLab: from 12.9.0 before 12.9.8; from 12.10.0 before 12.10.7; 13.0.0 — fixed in 12.10.7, 12.9.8

How to fix

Upgrade to a fixed version: GitLab 12.10.7, 12.9.8. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13262.json
https://gitlab.com/gitlab-org/gitlab/-/issues/211949
https://hackerone.com/reports/824689
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13262.json
https://gitlab.com/gitlab-org/gitlab/-/issues/211949
https://hackerone.com/reports/824689

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