What the vulnerability does
01Description
The Simple post listing plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'class_name' parameter in the postlist shortcode in all versions up to, and including, 0.2. This is due to insufficient input sanitization and output escaping on user-supplied attributes. 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 via mouse interaction.
Explanation of Vulnerability in Simple Terms
02Summary
Simple Post Listing versions 0.2 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has a changed scope, meaning injected code can affect other users and site functionality beyond the vulnerable component itself. Site administrators should update to a version newer than 0.2 as soon as a patch becomes available.
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 user account (e.g., contributor or subscriber role).
Key dates
06Disclosure timeline
December 12, 2025
CVE published
April 8, 2026
Record updated
