CVE-2026-102401 in Download Manager Plugin
Summary
by MITRE • 10/10/2026
The Download Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'regurl' parameter in all versions up to, and including, 3.3.71 due to insufficient input sanitization and output escaping. 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 an injected page. The injected payload only fires for logged-out site visitors, as the vulnerable login-form.php template branch is gated on !is_user_logged_in(); authenticated users viewing the same page are served a different template and are not affected.
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Analysis
by VulDB Data Team • 10/10/2026
The Download Manager plugin for WordPress contains a stored cross-site scripting vulnerability affecting all versions up to 3.3.71, stemming from insufficient input sanitization and output escaping of the regurl parameter. This flaw allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages that execute when accessed by other users. The attack vector relies on the attacker manipulating registration URLs within the plugin's configuration, which are then stored in the database without proper validation. When these maliciously crafted entries are rendered, they serve as a vehicle for executing client-side code in the context of victims who visit the affected page.
The operational impact is specifically targeted at logged-out site visitors due to the conditional logic governing template selection within the plugin's login-form.php file. The vulnerable code path is gated by an !is_user_logged_in() check, meaning that only unauthenticated users trigger the execution of the injected payload. Authenticated users viewing the same page are served a different template branch and remain unaffected by this specific exploitation vector. This distinction limits the scope of immediate impact to anonymous visitors but still poses significant risks including session hijacking, credential theft via phishing pages hosted through the compromised site, or defacement of the user experience for public-facing registration flows.
From an industry standards perspective, this vulnerability aligns with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting and specifically falls under Stored XSS where malicious scripts are permanently stored within target applications such as a database or content management system entries. In the MITRE ATT&CK framework for enterprise security, this behavior corresponds to T1059 Command and Control via Application Layer Protocol combined with T1189 Drive-by Client Side Scripting since it involves delivering malicious code through legitimate web traffic without requiring user interaction beyond page visitation. The requirement of contributor-level access indicates that privilege escalation is not necessary for exploitation but does impose a barrier to entry compared to unauthenticated injection vectors.
Mitigation strategies should prioritize immediate upgrading to version 3.3.72 or later where the input sanitization and output escaping mechanisms have been corrected by the developers. Until an update can be applied, administrators may consider restricting contributor-level access to trusted individuals only since this vulnerability requires at least that level of permission to exploit effectively. Additionally implementing a Web Application Firewall with rules capable of detecting and blocking script injection patterns in registration parameters can provide temporary protection against exploitation attempts while monitoring logs for suspicious activity related to the regurl parameter changes. Regular security audits focusing on input validation practices across all user-facing forms within WordPress plugins will help prevent similar vulnerabilities from being introduced or persisting in future releases.