What the vulnerability does
01Description
The Passster – Password Protect Pages and Content plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'content_protector' shortcode in all versions up to, and including, 4.2.24. 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 vulnerability was partially patched in version 4.2.21.
Explanation of Vulnerability in Simple Terms
02Summary
Passster versions up to 4.2.24 contain a stored cross-site scripting (XSS) vulnerability that allows authenticated users with low privileges to inject malicious scripts. The vulnerability has scope change, meaning injected code can affect other users and site functionality. An attacker needs a valid WordPress account to exploit this flaw.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that executes in other users' browsers and affects site functionality.
Potential impact on your site
04Site Impact
Authenticated attackers can deface content, steal session tokens, or redirect visitors to malicious sites.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress user account; no user interaction required.
Key dates
06Disclosure timeline
January 28, 2026
CVE published
April 8, 2026
Record updated