What the vulnerability does
01Description
The Download Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sid' parameter of the 'wpdm_members' shortcode in versions up to and including 3.3.52. This is due to insufficient input sanitization and output escaping on the user-supplied 'sid' shortcode attribute. The sid parameter is extracted without sanitization in the members() function and stored via update_post_meta(), then echoed directly into an HTML id attribute in the members.php template without applying esc_attr(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Download Manager versions 3.3.52 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability affects the scope beyond the vulnerable component, potentially impacting other users and site functionality. An attacker with low-level account access can craft malicious input that executes in other users' browsers without their interaction.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers, stealing session tokens or performing actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other site visitors; session hijacking and unauthorized actions are possible.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site; no user interaction required from the victim.
Key dates
06Disclosure timeline
April 9, 2026
CVE published
April 9, 2026
Record updated
