CVE-2026-109972
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
The s2Member plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'date_format' parameter in versions up to and including <= 261011 due to insufficient input sanitization and output escaping. An authenticated attacker with Contributor-level access or higher can inject arbitrary web scripts that execute when a user visits the 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.
Risk Assessment
An attacker with the Contributor role can execute arbitrary JavaScript in users' browsers, potentially leading to session hijacking or actions on behalf of the victim.
Recommendation
Update the s2Member plugin to a version later than 261011 and restrict Contributor privileges until the fix is applied.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS