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TI-2026-81740 Aliases CVE-2026-109972GHSA-2wqw-8w6m-g247

Stored cross-site scripting in s2Member WordPress plugin

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

The s2Member membership plugin for WordPress by clavaque is affected in all versions up to and including 261011. Its date_format shortcode attribute lacks input sanitization and output escaping, a cross-site scripting flaw (CWE-79). An authenticated attacker with contributor-level access or higher can store arbitrary web scripts in pages that run in the browser of any user who opens the injected page.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00275 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
clavaques2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptionsup to 261011—No fix listedCNA
  • s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions Vendorclavaque Affected up to 261011 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for s2Member.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-109972
  2. 2026-10-28 Alias added: GHSA-2wqw-8w6m-g247
  3. 2026-10-28 CISA SSVC decision points changed
  4. 2026-10-28 Priority changed: MEDIUM → LOW

References

Other 6

  • TI-2026-01651 s2Member <= 260127 - Unauthenticated Privilege Escalation via Account Takeover CVSS 3.1CRITICAL 9.8
  • TI-2026-84120 Code injection in s2Member plugin via item_name IPN parameter CVSS 3.1CRITICAL 9.8
  • TI-2026-16062 s2Member <= 260814 - Unauthenticated Remote Code Execution via 'first_name' Parameter in PayPal Proxy Return CVSS 3.1HIGH 8.8
  • TI-2024-07720 Information disclosure in clavaque s2Member – Excellent for All Kinds of Memberships… CVSS 3.1HIGH 8.8
  • TI-2024-00828 Improper access control in clavaque s2Member – Excellent for All Kinds of Memberships… CVSS 3.1MEDIUM 5.3
  • TI-2025-12552 s2Member <= 251005 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode CVSS 3.1MEDIUM 6.4
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences