XSS in Ultimatemember Ultimate Member – User Profile, Registration, Login, Directory, Content Restriction & Membership Plugin

CVE-2026-96270

The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_id' parameter in all versions up to, and including, 2.13.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().

Vulnerability class: XSS (Cross-Site Scripting)

Published .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-96270?
CVE-2026-96270 is a high-severity vulnerability in Ultimatemember Ultimate Member – User Profile, Registration, Login, Directory, Content Restriction & Membership Plugin, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-10-03.
How severe is CVE-2026-96270?
High severity. CVSS v3 base score is 7.2 out of 10.