CVE-2023-3500

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.0 before 16.0.8, all versions starting from 16.1 before 16.1.3, all versions starting from 16.2 before 16.2.2. A reflected XSS was possible when creating specific PlantUML diagrams that allowed the attacker to perform arbitrary actions on behalf of victims.

Affected

GitLab

CVSS v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 GITLAB

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.53% chance of exploitation in the next 30 days, 44th percentile

Published

2023-08-02

Updated

2025-11-20

Proof-of-concept exploits (1)

• https://hackerone.com/reports/2010926

References

• CVE Record
• NVD entry