CVE-2023-33007 in LoadComplete Support Plugin
Summary
by MITRE • 05/16/2023
Jenkins LoadComplete support Plugin 1.0 and earlier does not escape the LoadComplete test name, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.
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Analysis
by VulDB Data Team • 04/26/2025
The vulnerability identified as CVE-2023-33007 affects the Jenkins LoadComplete support Plugin version 1.0 and earlier, presenting a critical stored cross-site scripting flaw that can be exploited by authenticated attackers possessing Item/Configure permissions. This vulnerability resides within the plugin's handling of LoadComplete test names, where insufficient output escaping mechanisms fail to sanitize user-supplied input before it is stored and subsequently rendered in web interfaces. The issue stems from the plugin's failure to properly encode or escape special characters in test names, creating an environment where malicious script code can be persisted in the application's database and executed when the affected page is loaded by other users.
The technical exploitation of this vulnerability occurs through the manipulation of LoadComplete test names during the configuration process, where attackers can inject malicious JavaScript code into the test name field. When this stored data is later displayed in the Jenkins web interface, the unescaped script content executes within the context of other users' browsers, potentially enabling attackers to steal session cookies, perform unauthorized actions, or redirect users to malicious websites. This stored XSS vulnerability operates at the application layer and specifically targets the web UI rendering components of Jenkins, making it particularly dangerous as it can affect multiple users who view the compromised test names without requiring them to interact with the malicious content directly.
The operational impact of this vulnerability extends beyond simple script execution, as it can serve as a stepping stone for more sophisticated attacks within the Jenkins environment. An attacker with Item/Configure permissions can leverage this flaw to establish persistent access patterns, potentially escalating privileges or accessing sensitive build information. The vulnerability affects Jenkins installations that utilize the LoadComplete support plugin, creating a vector for attackers to compromise the integrity of the continuous integration environment and potentially gain access to source code repositories, build artifacts, or other sensitive information. The stored nature of the vulnerability means that the malicious payload remains active until manually removed, providing attackers with sustained access to the compromised system.
Mitigation strategies for CVE-2023-33007 should prioritize immediate plugin updates to versions that address the output escaping issue, as this represents the most direct solution to the vulnerability. Organizations should also implement network-level monitoring to detect potential exploitation attempts through anomalous script injection patterns in Jenkins API calls or web interface interactions. The principle of least privilege should be enforced by limiting Item/Configure permissions to only essential personnel, reducing the attack surface for this specific vulnerability. Additionally, implementing Content Security Policies and regular security scanning of Jenkins plugins can help prevent similar issues from arising in the future, aligning with industry best practices for web application security. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws, and represents a classic example of insecure output handling that violates fundamental web security principles. The ATT&CK framework categorizes this vulnerability under initial access and persistence techniques, as it enables attackers to establish footholds within the CI/CD environment and maintain access through stored malicious content.