Jenkins Gitlab Hook Plugin - XSS (CVE-2020-2096)

CVE-2020-2096 is a vulnerability in the Jenkins Gitlab Hook Plugin that can allow reflected cross-site scripting (XSS) due to insufficient escaping of project names in a specific endpoint.

CrowdSec has been tracking this vulnerability and its exploits since 1st of June 2025.

CrowdSec network observations suggest that most exploitation of CVE-2020-2096 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2020-2096 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2020-2096 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Observed attacks involve requests to URLs containing /gitlab/build_now and script tags.