Vulnerability · Published Nov 2, 2026 · Assigned by Wordfence

CVE-2026-86596s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter

Critical 9.8

In plain English

A critical-severity code injection in s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions from clavaque. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.5%top 25.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack tooling1Public PoC

Official 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 (as reported)

Vendor	Product	Versions
clavaque	s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions	0 – through 260927

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

In plain English

Official description

Affected products (as reported)

References