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A critical cross-site scripting (XSS) vulnerability in the popular Jenkins Gatling Plugin allows attackers to bypass Content-Security-Policy (CSP) protections.
The vulnerability, tracked as CVE-2025-5806, affects Gatling Plugin version 136.vb_9009b_3d33a_e and poses significant risks to Jenkins environments utilizing this performance testing integration tool.
The vulnerability stems from how Gatling Plugin 136.vb_9009b_3d33a_e serves Gatling performance testing reports within the Jenkins environment.
The plugin fails to properly implement Content-Security-Policy restrictions that were originally introduced in Jenkins versions 1.641 and 1.625.3 as a fundamental security measure against XSS attacks.
Jenkins Gatling Plugin Vulnerability
Content-Security-Policy (CSP) is a critical web security standard that helps prevent cross-site scripting attacks by controlling which resources can be loaded and executed by a web page.
When properly implemented, CSP acts as a defensive barrier that restricts the execution of unauthorized scripts, even if malicious content is injected into the application.
However, the Gatling Plugin’s current implementation bypasses these protections entirely when rendering performance test reports.
The vulnerability specifically manifests in the plugin’s report serving mechanism, where user-controlled content within Gatling reports can be leveraged to inject and execute malicious JavaScript code.
This bypass occurs because the plugin processes and displays report content without adequately enforcing the CSP headers that would normally prevent such script execution.
The exploitation of this vulnerability requires users with the ability to modify Gatling report content, which typically includes developers, QA engineers, and system administrators with appropriate Jenkins permissions.
Once exploited, attackers can execute arbitrary JavaScript code within the context of the Jenkins application, potentially leading to session hijacking, credential theft, or unauthorized administrative actions.
The high CVSS severity rating assigned to this vulnerability reflects its potential for significant impact on Jenkins’ infrastructure.
Successful exploitation could enable attackers to manipulate Jenkins configurations, access sensitive build information, modify deployment pipelines, or escalate privileges within the system.
Given Jenkins’ central role in many CI/CD environments, such a compromise could have cascading effects across entire development and deployment workflows.
| Risk Factors | Details |
| Affected Products | Jenkins Gatling Plugin versions ≤ 136.vb_9009b_3d33a_e |
| Impact | – Arbitrary script execution- Session/cookie theft- CSP bypass- Privilege escalation risks |
| Exploit Prerequisites | 1. Attacker has access to modify the Gatling report content. 2. The victim views a malicious report. 3. Unpatched Jenkins CSP implementation |
| CVSS 3.1 Score | 8.1 (High) |
Mitigation
Jenkins’ security team has confirmed that no patches are currently available for the affected Gatling Plugin version 136.vb_9009b_3d33a_e.
The advisory explicitly states that as of the publication date, there is no fix for this vulnerability, representing an unusual situation where Jenkins has disclosed a vulnerability without an accompanying patch.
The primary mitigation strategy recommended by Jenkins involves downgrading to Gatling Plugin version 1.3.0, which is not affected by this vulnerability.
Organizations should immediately assess their Jenkins environments to identify installations running the vulnerable plugin version and plan for downgrade procedures.
Security teams should implement additional monitoring for unusual Jenkins activity, particularly focusing on report generation and viewing activities. Network segmentation and access controls should be reviewed to limit the exposure of Jenkins instances to untrusted users.
Organizations unable to immediately downgrade should consider temporarily disabling the Gatling Plugin until a permanent fix becomes available.
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The post Jenkins Gatling Plugin Vulnerability Let Attackers Bypass Content-Security-Policy Protection appeared first on Cyber Security News.
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