CVE-2026-109972

01/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.

02/References6

• plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/…
• plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/…
• plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/…
• plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/…
• plugins.trac.wordpress.org/changeset/3751344/s2member/trunk/src…
• www.wordfence.com/threat-intel/vulnerabilities/id/2782f0f7-625d…