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CVE-2025-9260: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 5.1.16 - 6.1.1 - Authenticated (Subscriber+) PHP Object Injection To Arbitrary File Read

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-03 · updated 2026-06-17
• Weakness: CWE-502

Description

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to PHP Object Injection in versions 5.1.16 to 6.1.1 via deserialization of untrusted input in the parseUserProperties function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to read arbitrary files. If allow_url_include is enabled on the server, remote code execution is possible. While the vendor patched this issue in version 6.1.0, the patch caused a fatal error in the vulnerable code, due to a missing class import, so we consider 6.1.2 to be the most complete and best patched version

Affected products

• techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: from 5.1.16 through 6.1.1

References

• https://plugins.trac.wordpress.org/browser/fluentform/tags/6.0.2/app/Services/FormBuilder/EditorShortcodeParser.php#L214
• https://plugins.trac.wordpress.org/browser/fluentform/tags/6.0.2/vendor/wpfluent/framework/src/WPFluent/View/View.php#L7
• https://www.wordfence.com/threat-intel/vulnerabilities/id/938e5d6b-1ad6-4021-a148-1d1c9e8a0a83?source=cve

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