CVE-2026-96270 Ultimate Member <= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'form_id' Parameter
Unauthenticated attackers can inject malicious scripts via the form_id parameter, which execute when administrators view user records, potentially leading to session hijacking or admin takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-96270?
CVE-2026-96270 is a high-severity cross-site scripting vulnerability in ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin, published on 3 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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().
Weakness: CWE-79
Which versions are affected by CVE-2026-96270?
How do I fix CVE-2026-96270?
No fix has been published for CVE-2026-96270 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-96270 being exploited?
There is no known exploitation of CVE-2026-96270 in the wild and no public exploit code.
Sources
Also known as GHSA-6phc-8h2j-74hw.