# CVE-2026-103427: Simple Membership plugin stored XSS in country parameter

Source: https://junglewise.ai/threats/cve-2026-103427-the-simple-membership-plugin-for-wordpress-is-vulnerable-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-10. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-103427 · Severity: medium · CVSS 6.4 · Published 2026-10-10

The Simple Membership plugin for WordPress, which manages user registrations and profiles, contains a stored cross-site scripting vulnerability in the country field. Authenticated users with subscriber access can inject malicious scripts that execute for any visitor accessing affected pages; unauthenticated attackers can also exploit this if the plugin allows free membership registration. This could lead to account takeover, credential theft, or malware distribution to site visitors.

Vendors: [WordPress.org](https://junglewise.ai/threats/vendors/wordpress-org).

## Quick answers

**Is CVE-2026-103427 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103427 being exploited in the wild.

**How severe is CVE-2026-103427?** Medium severity, with a CVSS score of 6.4, published 10 October 2026.

**Which products and versions are affected?** WordPress.org Simple Membership up to and including 4.8.4.

**Is there a fix for CVE-2026-103427?** Yes: fixed in 4.8.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103427 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-103427?** Check whether you run WordPress.org Simple Membership at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 4.8.5

## Technical details

The vulnerability is a stored XSS in the 'country' parameter due to insufficient input sanitization and output escaping in the Simple Membership plugin. Authenticated subscribers and above can inject arbitrary scripts; unauthenticated attackers can do so when the "Enable Free Membership" feature permits anonymous registration and profile submission. The injected scripts persist and execute in the context of any user viewing the affected profile or page.

## Affected products

- WordPress.org Simple Membership up to and including 4.8.4

## Timeline

- 2026-10-10: disclosed

## References

- [https://downloads.wordpress.org/plugin/simple-membership.4.8.5.zip](https://downloads.wordpress.org/plugin/simple-membership.4.8.5.zip)
- [https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.4/classes/class.swpm-form.php](https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.4/classes/class.swpm-form.php)

## Related threats

- [Simple Membership WordPress plugin unauthorized account activation and credential disclosure](https://junglewise.ai/threats/cve-2026-97337-the-simple-membership-plugin-for-wordpress-is-vulnerable-to)