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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0021.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
wpinsider-1 Simple Membership unaffected
Version Status Constraints
0 affected ≤ 4.8.4

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://downloads.wordpress.org/plugin/simple-membership.4.8.5.zip cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.4/classes/class.swpm-form.php#L158 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.4/classes/class.swpm-utils-misc.php#L1060 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.4/views/admin_member_form_common_part.php#L42 cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/fbebb9d4-c445-473d-a5f6-beac00ebe7aa?source=cve cve-icon cve-icon
History

Sun, 11 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sat, 10 Oct 2026 07:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-10-11T12:13:44.961Z

Reserved: 2026-09-30T14:55:37.102Z

Link: CVE-2026-103427

cve-icon Vulnrichment

Updated: 2026-10-11T12:12:32.487Z

cve-icon NVD

Status : Received

Published: 2026-10-10T07:16:40.120

Modified: 2026-10-11T13:17:10.500

Link: CVE-2026-103427

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-10T08:30:07Z

Weaknesses