What is CVE-2026-3300?

CVE-2026-3300 is a critical-severity vulnerability in Wpeverest Everest Forms Pro, classified under Code Injection. CVSS score: 9.8/10. Published 2026-03-31.

How severe is CVE-2026-3300?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-3300 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Wpeverest Everest Forms Pro

CVE-2026-3300

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.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.410 (98.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Wpeverest Everest Forms Pro — versions 0

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-3300?: CVE-2026-3300 is a critical-severity vulnerability in Wpeverest Everest Forms Pro, classified under Code Injection. CVSS score: 9.8/10. Published 2026-03-31.
How severe is CVE-2026-3300?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-3300 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.