CVE-2026-18406 SureForms <= 2.12.2 - Unauthenticated Stored Cross-Site Scripting via Text Field Entity-Encoded Payload
Unauthenticated attackers can inject arbitrary scripts via text fields in SureForms, leading to code execution when users view the page.
- 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-2026-18406?
CVE-2026-18406 is a high-severity cross-site scripting vulnerability in brainstormforce SureForms – Contact Form Builder, AI Forms, Payment Form, Survey & Quiz, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The SureForms – Contact Form Builder, AI Forms, Payment Form, Survey & Quiz plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Text Field Entity-Encoded Payload in all versions up to, and including, 2.12.2 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-18406?
How do I fix CVE-2026-18406?
No fix has been published for CVE-2026-18406 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-2026-18406 being exploited?
There is no known exploitation of CVE-2026-18406 in the wild and no public exploit code.
Sources
Also known as GHSA-8wjx-gmr5-4m9q.