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TI-2026-70234 Aliases CVE-2026-103427GHSA-39ch-8xp7-gcgh

Stored cross-site scripting in Simple Membership 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 Simple Membership WordPress plugin up to and including 4.8.4 is affected by stored cross-site scripting (CWE-79). Insufficient output escaping and input sanitization of the country parameter let injected scripts persist in pages. An authenticated attacker with subscriber access or higher can inject scripts that run when users open an injected page. Unauthenticated attackers can also exploit it when the Enable Free Membership feature is on, through anonymous front-end registration.

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

Description from the CNA

The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'country' parameter in all versions up to, and including, 4.8.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Unauthenticated attackers may also exploit this vulnerability when the plugin's Enable Free Membership feature is turned on, as it permits anonymous front-end registration and profile submission.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0021 11th 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
wpinsider-1Simple Membershipup to 4.8.4—No fix listedCNA
  • Simple Membership Vendorwpinsider-1 Affected up to 4.8.4 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:simple-membership-plugin:simple_membership:*:*:*:*:*:*:*:*——wpinsider-1
  • cpe:2.3:a:simple-membership-plugin:simple_membership:*:*:*:*:*:*:*:* Versions — — ·wpinsider-1

Remediation

The sources list no fixed version for Simple Membership.

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

Timeline

  1. 2026-10-10 Threatist record created from CVE-2026-103427
  2. 2026-10-10 Alias added: GHSA-39ch-8xp7-gcgh
  3. 2026-10-11 CISA SSVC decision points changed
  4. 2026-10-11 Priority changed: MEDIUM → LOW

References

Other 5

  • TI-2022-04084 Simple Membership < 4.2.2 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
  • TI-2023-22342 WordPress Simple Membership plugin <= 4.3.4 - Unauthenticated Membership Role Privilege Escalation vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-02140 Simple Membership < 4.1.3 - Unauthenticated Membership Privilege Escalation CVSS 3.1CRITICAL 9.8
  • TI-2019-10675 The Simple Membership plugin before 3.8.5 for WordPress has CSRF affecting the Bulk Operation section. CVSS 3.0HIGH 8.8
  • TI-2023-22341 WordPress Simple Membership plugin <= 4.3.4 - Authenticated Account Takeover vulnerability CVSS 3.1HIGH 8.8
  • TI-2024-10273 Simple Membership <= 4.5.5 - Exposure of Private Personal Information to an Unauthorized Actor CVSS 3.1HIGH 7.5
See all 26 →

Sources

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