CVE-2020-13262 - CVE House
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Status published Medium CVE-2020-13262

Client-Side code injection through Mermaid markup in GitLab CE/EE 12.9...

Vulnerability 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

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Thanks @yvvdwf for reporting this vulnerability through our HackerOne bug bounty program

References

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CVE-2025-9642
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Affected Vendor

Affected Software

GitLab
Vulnerable Versions:
>=12.9, <12.9.8, >=12.10, <12.10.7, >=13.0, <13.0.1

Timeline

Official Publish: June 19th, 2020
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.