Overview
The CVE-2025-5806 is a major security vulnerability found in the Jenkins Gatling Plugin 136.vb_9009b_3d33a_e, which affects its ability to serve Gatling reports. This vulnerability allows for a significant bypass of the Content-Security-Policy protection implemented in Jenkins versions 1.641 and 1.625. As a result, an attacker can exploit a cross-site scripting (XSS) vulnerability, potentially leading to a system compromise or data leakage. The severity of this issue is heightened due to the widespread use of Jenkins as an open-source automation server, used by developers for building, testing, and deploying software.
Vulnerability Summary
CVE ID: CVE-2025-5806
Severity: High (8.0 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Jenkins Gatling Plugin | 136.vb_9009b_3d33a_e
How the Exploit Works
The vulnerability stems from the Jenkins Gatling Plugin’s method of serving Gatling reports. This process bypasses the Content-Security-Policy protection implemented in Jenkins versions 1.641 and 1.625, thereby exposing a cross-site scripting (XSS) vulnerability. An attacker, who can change the report content, can then inject malicious scripts that are executed in the user’s browser. This could allow the attacker to steal sensitive information or to perform actions on behalf of the victim user.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. This represents a malicious payload being inserted into a Gatling report:
POST /jenkins/gatling-plugin/report HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "report_content": "<script>malicious_code_here</script>" }In this conceptual example, the “malicious_code_here” would be replaced with the actual malicious JavaScript that the attacker wishes to execute in the user’s browser. Please note, this is a simplified representation of the exploit and actual attacks may involve more complex techniques.
Mitigation Guidance
The primary mitigation for CVE-2025-5806 is to apply the vendor-supplied patch. If for some reason, patching is not immediately possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block or flag malicious traffic can serve as a temporary mitigation. These systems can be configured to detect and block attempts to exploit this vulnerability, providing a layer of defense while a more permanent solution is implemented.