Vulnerability · Published Oct 28, 2026 · Assigned by Wordfence

CVE-2026-109972s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute

Medium 6.4

In plain English

A medium-severity cross-site scripting in s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions from clavaque. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)6.4Medium

Exploit odds (30 days)0.3%top 80.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
clavaque	s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions	0 – through 261011

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

In plain English

Official description

Affected products (as reported)

References