CVE-2025-8871 Everest Forms (Pro) <= 1.9.7 - Unauthenticated PHP Object Injection via PHAR Deserialization in Form Signature
Unauthenticated attackers can inject PHP objects via PHAR deserialization in Everest Forms Pro, potentially leading to code execution or data theft if a POP chain exists.
- 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-2025-8871?
CVE-2025-8871 is a medium-severity unsafe deserialization vulnerability in WPEverest Everest Forms Pro, published on 5 Nov 2025. 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 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.
Weakness: CWE-502
Which versions are affected by CVE-2025-8871?
How do I fix CVE-2025-8871?
No fix has been published for CVE-2025-8871 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-8871 being exploited?
There is no known exploitation of CVE-2025-8871 in the wild and no public exploit code.
Sources
Also known as GHSA-6wgh-rvcx-89g9.