Jenkins Gitlab Hook Plugin - XSS (CVE-2020-2096)
152Exploiting IPs reported
Jenkins Gitlab Hook Plugin 1.4.2 and earlier does not escape project names in the build_now endpoint, resulting in a reflected XSS vulnerability.
CrowdSec analysis
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.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2020-2096 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. 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.
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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