What the vulnerability does
01Description
The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'swpm_paypal_subscription_cancel_link' shortcode in all versions up to, and including, 4.4.5 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.
Explanation of Vulnerability in Simple Terms
02Summary
Simple Membership versions up to 4.4.5 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users on the site. The vulnerability exists in a component with changed scope, meaning the impact extends beyond the vulnerable feature itself. An attacker with low-level account access can craft malicious input that executes in other users' browsers, potentially stealing session data or performing actions on their behalf.
What an attacker can do
03Attacker Capabilities
Inject JavaScript code that runs in other users' browsers and steals their session data or performs actions as them.
Potential impact on your site
04Site Impact
Authenticated users can compromise other users' accounts or sessions; site admins should upgrade immediately.
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
May 9, 2024
CVE published
April 8, 2026
Record updated
