Everest Forms (Pro) <= 1.9.7 - Unauthenticated PHP Object Injection via PHAR Deserialization in Form Signature
| CVE | CVE-2025-8871 |
|---|---|
| CVSS | 5.6 (Medium) |
| Publicly Published | November 4, 2025 |
| Last Updated | November 5, 2025 |
| Researcher |
Alex Thomas
- Wordfence
|
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.
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Vulnerability Details for Everest Forms Pro
| Software Type | Plugin |
|---|---|
| Software Slug | everest-forms-pro |
| Patched? | Yes |
| Remediation | Update to version 1.9.8, or a newer patched version |
| Affected Version |
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| Patched Version |
|
Recent vulnerabilities in Everest Forms Pro
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Everest Forms Pro <= 1.9.12 - Unauthenticated Remote Code Execution via Calculation Field | CVE-2026-3300 | h0xilo | March 30, 2026 | |
| 2 | Everest Forms Pro <= 1.9.12 - Unauthenticated Stored Cross-Site Scripting | CVE-2026-27070 | Kishan Vyas | March 12, 2026 | |
| 3 | Everest Forms (Pro) <= 1.9.4 - Unauthenticated Path Traversal to Arbitrary File Deletion | CVE-2025-5927 | Phat RiO | June 24, 2025 |
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