Jenkins Gitlab Hook Plugin - XSS (CVE-2020-2096)
97Exploiting 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.
Based on data from the CrowdSec network, nearly all observed exploitation of CVE-2020-2096 is fully opportunistic, with attackers indiscriminately scanning the entire internet. These attacks are automated and lack any form of target selection or reconnaissance. CrowdSec network telemetry also shows that exploitation of CVE-2020-2096 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.
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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