Unauthenticated PHP Code Injection RCE in Everest Forms Pro Complex Calculation
CVE-2026-3300 is a critical remote code execution vulnerability in the Everest Forms Pro WordPress plugin affecting all versions up to and including 1.9.12. The flaw is in the Calculation Addon’s process_filter() function within the Complex Calculation feature, where user-supplied form field values are concatenated into a dynamically constructed PHP code string and then executed via eval(). Although input is passed through sanitize_text_field(), that function does not escape single quotes and other characters significant in PHP code context. As a result, an attacker can break out of the intended string context and inject arbitrary PHP code. Exploitation is possible through crafted submissions to string-type form fields such as text, email, URL, select, and radio fields on forms that use the Complex Calculation feature. The issue is exploitable without authentication and has been observed in active exploitation in the wild.
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Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Recent activity
24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated remote code execution vulnerability in the Everest Forms Pro WordPress plugin caused by unsafe eval() use in the Complex Calculation feature, enabling arbitrary PHP code injection and execution.
A critical remote code execution vulnerability in the Everest Forms Pro WordPress plugin caused by improper input validation in the complex calculation feature, allowing unauthenticated attackers to inject and execute arbitrary PHP code and fully compromise affected sites.
A critical remote code execution vulnerability in the Everest Forms Pro WordPress plugin caused by unsafe concatenation of user-supplied form values into PHP code that is executed with eval() in the Calculation Addon’s process_filter() function.
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