CVE-2026-3300 Everest Forms Pro <= 1.9.12 - Unauthenticated Remote Code Execution via Calculation Field
Unauthenticated attackers can execute arbitrary PHP code on servers using the Everest Forms Pro plugin if the Complex Calculation feature is enabled.
- 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-2026-3300?
CVE-2026-3300 is a critical code injection vulnerability in WPEverest Everest Forms Pro, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Everest Forms Pro plugin for WordPress is vulnerable to Remote Code Execution via PHP Code Injection in all versions up to, and including, 1.9.12. This is due to the Calculation Addon's process_filter() function concatenating user-submitted form field values into a PHP code string without proper escaping before passing it to eval(). The sanitize_text_field() function applied to input does not escape single quotes or other PHP code context characters. This makes it possible for unauthenticated attackers to inject and execute arbitrary PHP code on the server by submitting a crafted value in any string-type form field (text, email, URL, select, radio) when a form uses the "Complex Calculation" feature.
Weakness: CWE-94
Which versions are affected by CVE-2026-3300?
How do I fix CVE-2026-3300?
No fix has been published for CVE-2026-3300 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-3300 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3300 exists.
Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.
Sources
Also known as GHSA-jfqc-5rvh-wp99.