What the vulnerability does
01Description
The WP-Members Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Multiple Checkbox and Multiple Select user profile fields in all versions up to, and including, 3.5.4.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Subscriber-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
WP-Members Membership Plugin versions 3.5.4.3 and earlier contain a cross-site scripting (XSS) vulnerability. An authenticated user can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction—the victim must visit a page containing the attacker's payload. Impact is limited to low-level data theft or session hijacking within the site.
What an attacker can do
03Attacker Capabilities
Inject JavaScript that runs in other users' browsers to steal session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users' accounts and data are at risk if they visit pages containing attacker-injected content.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site; victim must visit a page with the malicious payload.
Key dates
06Disclosure timeline
January 15, 2026
CVE published
April 8, 2026
Record updated
