CVE-2026-18146 Fluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode Values
Unauthenticated attackers can inject scripts via notification smartcodes, leading to admin account takeover when viewing submission logs.
- 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-2026-18146?
CVE-2026-18146 is a high-severity cross-site scripting vulnerability in wpmanageninja Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Notification Smartcode Values in all versions up to, and including, 6.2.11 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the browser of an administrator (or any user with the Fluent Forms entry-viewing capability) when they view the form's entry Submission Logs in the WordPress admin dashboard. Exploitation requires that a site administrator or Fluent Forms manager has configured an email notification whose subject or static (direct) Send To value references an attacker-influenced Smartcode such as an input_password field value, a cookie value, or submission.response.
Weakness: CWE-79
Which versions are affected by CVE-2026-18146?
How do I fix CVE-2026-18146?
No fix has been published for CVE-2026-18146 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-2026-18146 being exploited?
There is no known exploitation of CVE-2026-18146 in the wild and no public exploit code.
Sources
Also known as GHSA-3wxr-qqfv-gjrh.