Vulnerability details
CVE-2026-86596
clavaque s2Member – Excellent for All Kinds of Memberships
s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter
CVSS 3.1
9.8Critical
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (Wordfence) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| clavaque | s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions | v ≤ 260927 | CVEProject cvelistV5 (CNA) |
References and advisories
9- https://www.wordfence.com/threat-intel/vulnerabilities/id/bbe64cd3-c5ca-4867-90de-4784510a1126?source=cve
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utilities.inc.php#L49
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L138
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L131
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-web-accept-sp.inc.php#L104
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/utils-strings.inc.php#L201
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in.inc.php#L49
- https://plugins.trac.wordpress.org/browser/s2member/tags/260829/src/includes/classes/paypal-notify-in-subscr-or-wa-w-level.inc.php#L514
- https://plugins.trac.wordpress.org/changeset/3722434/s2member
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Details
- Published
- 2026-11-03
- Last updated
- 2026-11-08
- State
- Published
- Assigner (CNA)
- Wordfence
- Kolun priority
- 33 · Low
Exploit prediction (EPSS)
1.48%
Probability of exploitation in 30 days
74.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-94Improper Control of Generation of Code