CVE-2026-109972 s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-109972?
CVE-2026-109972 is a medium-severity vulnerability in clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions, published on 28 Oct 2026.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109972?
How do I fix CVE-2026-109972?
No fix has been published for CVE-2026-109972 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109972 being exploited?
There is no known exploitation of CVE-2026-109972 in the wild and no public exploit code.
Sources
Also known as GHSA-2wqw-8w6m-g247.