Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.15 - PHP Object Injection via extractDynamicValues
The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 5.1.15 via deserialization of untrusted input in the extractDynamicValues function. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a PHP Object. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code. Successful exploitation requires the attacker to have "View Form" and "Manage Form" permissions, which must be explicitly set by an administrator. However, this requirement can be bypassed when this vulnerability is chained with CVE-2024-2771.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder | <= 5.1.15 | 5.1.16 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- WordPress
- Package
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder- Disclosed
- 21.05.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
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Vulnerability history: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 45
- First → latest
- 06.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 10
- Medium 34
Disclosures per year
- 2021: 1
- 2022: 1
- 2023: 3
- 2024: 15
- 2025: 4
- 2026: 21
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Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.15 - PHP Object Injection via extractDynamicValues this entry
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