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

Quick assessment

Affected
clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件"s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions"在版本 261011 及以下（含该版本）中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于对"date_format"参数的输入过滤不足以及输出转义缺失。具备贡献者（Contributor）及以上权限的已认证攻击者，可利用此漏洞在页面中注入任意 Web 脚本；当其

CVSS 6.4 · Medium EPSS 0.27% · P20

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions ≤ 261011 affected
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I. Basic Information for CVE-2026-109972

Vulnerability Information
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Vulnerability Title
s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
clavaque s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions 0 ~ 261011 -

II. Public POCs for CVE-2026-109972

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III. Intelligence Information for CVE-2026-109972

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Patches & Fixes for CVE-2026-109972 (1)

Vendor Pages for CVE-2026-109972 (5)

IV. Related Vulnerabilities

Same product: s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions
Same vendor: clavaque
Same weakness: CWE-79