Is CVE-2026-96660 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-96660 being exploited in the wild.

How severe is CVE-2026-96660?

High severity, with a CVSS score of 7.2, published 17 October 2026.

Which products and versions are affected?

Themeisle User Registration & Membership up to 5.2.8.

Is there a fix for CVE-2026-96660?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-96660 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-96660?

Check whether you run Themeisle User Registration & 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.

CVE-2026-96660: User Registration & Membership plugin stored XSS in checkbox field

CVE-2026-96660 · Severity: high · CVSS 7.2 · Published 2026-10-17

The User Registration & Membership WordPress plugin allows unauthenticated attackers to inject malicious scripts into registration forms via checkbox fields due to insufficient input validation. When users visit pages containing injected forms, the malicious scripts execute in their browsers, potentially stealing credentials, session tokens, or sensitive data. This affects websites using the plugin for membership management and user registration.

Vendors: Themeisle.

Quick answers

Is CVE-2026-96660 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-96660 being exploited in the wild.
How severe is CVE-2026-96660?: High severity, with a CVSS score of 7.2, published 17 October 2026.
Which products and versions are affected?: Themeisle User Registration & Membership up to 5.2.8.
Is there a fix for CVE-2026-96660?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-96660 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-96660?: Check whether you run Themeisle User Registration & 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.

Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw in checkbox field value handling, exploitable via the nopriv AJAX action user_registration_user_form_submit which calls ur_process_registration() without nonce validation. Unauthenticated attackers can inject arbitrary JavaScript that persists in the database and executes whenever any user accesses the affected form. The root cause is insufficient input sanitization and output escaping in the form handler.

Affected products

Themeisle User Registration & Membership up to 5.2.8

Timeline

2026-10-17: disclosed

References

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