PHP Object Injection Vulnerability in Everest Forms (Pro) for WordPress

CVE-2025-8871

What is CVE-2025-8871?

The Everest Forms (Pro) plugin for WordPress is susceptible to PHP Object Injection due to improper handling of untrusted input during the deserialization process in the mime_content_type() function. Unauthenticated attackers can exploit this flaw when a form contains a non-required signature field paired with an image upload field. Notably, this vulnerability does not directly compromise the application unless a compatible PHP Object Pollution (POP) chain exists through other installed plugins or themes. If such a chain is present, it could enable attackers to delete files, access sensitive information, or execute malicious code, primarily in systems running PHP versions prior to 8.

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