CVE-2021-22225 - CVE House
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Status published Medium CVE-2021-22225

Insufficient input sanitization in markdown in GitLab version 13.11 and...

Vulnerability Description

Insufficient input sanitization in markdown in GitLab version 13.11 and up allows an attacker to exploit a stored cross-site scripting vulnerability via a specially-crafted markdown

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 [vovohelofor](https://hackerone.com/vovohelo) reporting this vulnerability through our HackerOne bug bounty program

References

More from GitLab

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CVE-2025-9958
Insertion of Sensitive Information Into Sent Data in GitLab
High 7.7
CVE-2025-9957
Incorrect Authorization in GitLab
Low 2.7
CVE-2025-9825
Missing Authorization in GitLab
Medium 5
CVE-2025-9642
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 8.7
CVE-2025-9484
Missing Authorization in GitLab
Medium 4.3

Affected Vendor

Affected Software

GitLab
Vulnerable Versions:
>=13.11.3, <13.11.6, >=13.12, <13.12.6, >=14.0, <14.0.2

Timeline

Official Publish: July 7th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/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.