Everest Forms (Pro) <= 1.9.7 - Unauthenticated PHP Object Injection via PHAR Deserialization in Form Signature

The Everest Forms (Pro) plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.9.7 via deserialization of untrusted input in the mime_content_type() function. This makes it possible for unauthenticated attackers to inject a PHP Object. This vulnerability may be exploited by unauthenticated attackers when a form is present on the site with a non-required signature form field along with an image upload field. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. This vulnerability is only exploitable in PHP versions prior to 8.

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Published

Nov 04, 2025

Last Updated

Nov 05, 2025

Slug

everest-forms-pro

Risk Profile

5.6 CVSS Score

Weakness

Deserialization of Untrusted Data

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Researchers

Alex Thomas

Operational Summary

What the operator needs to know

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Patch Status

Patched release is available

Remediation

Update to version 1.9.8, or a newer patched version

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/11d45287-f875-4cc9-aaf6-47158fe32858?source=api-prod

Detailed Metadata

Software Type	Plugin
Software Slug	everest-forms-pro View on wordpress.org
CVE	CVE-2025-8871
Patched Versions	1.9.8
Affected Versions	*-1.9.7

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MITRE

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