CVE-2026-86596 s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter
CriticalCVSS 9.8
EPSS 1.5%
- Published
- Updated
- Exploit status
- No public exploit known
Description
The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, <= 260927 via the 'item_name' parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal '<?' sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid '<?php' opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions | <= 260927 | No fix listed |
| wordpress s2member(WordPress) | < 261001 | 261001 |