CVE-2026-100186 User Profile Builder <= 4.0.3 - Unauthenticated Stored Cross-Site Scripting via First Name Field
Unauthenticated attackers can inject scripts via the First Name field when Email Confirmation is enabled, leading to potential account 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-2026-100186?
CVE-2026-100186 is a high-severity cross-site scripting vulnerability in cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via First Name Field in all versions up to, and including, 4.0.3 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. This vulnerability is only exploitable when the Email Confirmation feature is enabled in Profile Builder.
Weakness: CWE-79
Which versions are affected by CVE-2026-100186?
How do I fix CVE-2026-100186?
No fix has been published for CVE-2026-100186 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-2026-100186 being exploited?
There is no known exploitation of CVE-2026-100186 in the wild and no public exploit code.
Sources
Also known as GHSA-cx8v-98r8-v7fw.