CVE-2019-10376

Vulnerability

The Jenkins Wall Display Plugin version 0.6.34 and earlier contains a reflected cross-site scripting (XSS) vulnerability. The plugin fails to properly sanitize user-supplied input that is reflected back in web pages, allowing an attacker to inject arbitrary HTML or JavaScript code [1].

Exploitation

An attacker can exploit this flaw by crafting a malicious URL containing the injected script. The victim must be tricked into clicking the link, typically through phishing or by embedding the link on another site. No authentication is required to trigger the reflected XSS; any user visiting the crafted URL will execute the attacker's script in the context of the Jenkins UI [2].

Impact

Successful exploitation enables the attacker to execute arbitrary JavaScript in the victim's browser. This can lead to session hijacking, credential theft, or performing actions on behalf of the victim within Jenkins, potentially compromising the CI/CD pipeline.

Mitigation

As of the advisory date, no fix has been released for the Wall Display Plugin. Users are advised to disable or remove the plugin if it is not essential, or to restrict access to the Jenkins instance to trusted users only. The vulnerability is listed among unresolved issues in the Jenkins security advisory [1][2].