# CVE-2026-109972: s2Member Stored Cross-Site Scripting in date_format parameter

Source: https://junglewise.ai/threats/cve-2026-109972-the-s2member-excellent-for-all-kinds-of-memberships-content  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-109972 · Severity: medium · CVSS 6.4 · Published 2026-10-28

The s2Member plugin for WordPress manages member access and content restrictions. Authenticated contributors can inject malicious scripts into pages through a date formatting parameter, which execute when users view those pages. This allows attackers with contributor-level permissions to compromise website visitors through stored XSS attacks.

Technologies: [s2Member](https://junglewise.ai/threats/technologies/s2member). Vendors: [s2Member](https://junglewise.ai/threats/vendors/s2member).

## Quick answers

**Is CVE-2026-109972 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109972 being exploited in the wild.

**How severe is CVE-2026-109972?** Medium severity, with a CVSS score of 6.4, published 28 October 2026.

**Which products and versions are affected?** s2Member up to and including 261011.

**Is there a fix for CVE-2026-109972?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-109972 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109972?** Check whether you run s2Member at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Stored Cross-Site Scripting vulnerability exists in the date_format parameter due to insufficient input sanitization and output escaping. Authenticated attackers with contributor access or above can inject arbitrary web scripts by exploiting the fact that wp_kses_post() is bypassed via backslash-escaped sequences that PHP's date() function converts to HTML tag characters at render time, after WordPress's shortcode_parse_atts() applies stripcslashes() to attribute values.

## Affected products

- s2Member s2Member up to and including 261011

## Timeline

- 2026-10-28: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php](https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php)
- [https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php](https://plugins.trac.wordpress.org/browser/s2member/trunk/src/includes/classes/sc-gets-in.inc.php)

## Related threats

- [s2Member WordPress plugin remote code execution via item_name](https://junglewise.ai/threats/cve-2026-86596-the-s2member-plugin-for-wordpress-is-vulnerable-to-remote-code)
- [s2Member code execution in Signup Tracking Codes](https://junglewise.ai/threats/cve-2026-19804-the-s2member-excellent-for-all-kinds-of-memberships-content)
- [s2Member WordPress plugin stored XSS via shortcode attributes](https://junglewise.ai/threats/cve-2026-15047-s2member-wordpress-plugin-stored-xss-via-shortcode-attributes)