Jenkins Gitlab Hook Plugin - XSS (CVE-2020-2096)
104Exploiting 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. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2020-2096 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2020-2096 is currently experiencing high visibility and active exploitation across the internet.
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
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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