CVE-2026-86596
s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter
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.
| CWE | CWE-94 |
| Vendor | clavaque |
| Product | s2member – excellent for all kinds of memberships, content restriction paywalls & member access subscriptions |
| Published | Nov 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H