CVE-2020-2152

Vulnerability

Overview

The Jenkins Subversion Release Manager Plugin, in versions 1.2 and earlier, fails to properly escape error messages generated during form validation of the Repository URL field [1][3]. This omission allows an attacker to inject arbitrary HTML and JavaScript into the error response, which is then reflected back to the user's browser without sanitization.

Exploitation

Requirements

To exploit this reflected cross-site scripting (XSS) vulnerability, an attacker must convince a victim to interact with a maliciously crafted link that triggers the form validation error [1]. The vulnerability is reflected; no stored data is involved, and no prior authentication is required on the part of the attacker, though the victim must be a user with access to the Jenkins instance.

Impact

Successful exploitation enables an attacker to execute arbitrary JavaScript in the context of the victim's Jenkins session [1]. This could lead to actions such as modifying Jenkins configuration, exfiltrating sensitive data, or performing operations on behalf of the victim user.

Mitigation

The vendor has acknowledged the vulnerability but has not released a fix; users are advised to disable the plugin or apply strict input validation as a workaround [2]. The plugin remains listed among unresolved security issues in the Jenkins security advisory of 2020-03-09 [1][2].