CVE-2026-109972
Description
The s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'date_format' parameter in all versions up to, and including, <= 261011 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses wp_kses_post() on save because it contains no literal angle brackets — only backslash-escaped sequences that PHP's date() materializes into HTML tag characters at render time after WordPress's shortcode_parse_atts() applies stripcslashes() to the attribute value.
Affected WordPress components
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s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions Plugin · s2memberUp to and including 261011View on WordPress.org
A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.
Affected products and versions
- clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions — Up to and including 261011
References
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L119
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L53
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php#L98
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/codes.inc.php#L24
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3751344/s2member/trunk/src/includes/classes/sc-gets-in.inc.php
- www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/2782f0f7-625d-4141-8e2c-4bdaa0219007?source=cve
- nvd.nist.gov Official NVD record