RCE in Clavaque S2member – Excellent For All Kinds Of Memberships, Content Restriction Paywalls & Member Access Subscriptions

CVE-2026-86596

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.

Vulnerability class: RCE (Remote Code Execution)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-86596?
CVE-2026-86596 is a critical-severity vulnerability in Clavaque S2member – Excellent For All Kinds Of Memberships, Content Restriction Paywalls & Member Access Subscriptions, classified under Code Injection. CVSS score: 9.8/10. Published 2026-11-02.
How severe is CVE-2026-86596?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-86596 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.