Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/s
- https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/s
- https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/s
- https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/codes.inc
- https://plugins.trac.wordpress.org/changeset/3751344/s2member/trunk/src/includes
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2782f0f7-625d-4141-8e2
FAQ
What is CVE-2026-109972?
CVE-2026-109972 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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...
How severe is CVE-2026-109972?
CVE-2026-109972 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-109972?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.