CVE-2024-13666

Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder <= 5.2.12 - IP-Spoofing

2025-03-21 19:39
shaman0x01

Strategic Overview

Status
Patched in 6.0.0
Affected Plugin
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Affected Version
<= 5.2.12
CVSS
5.3Medium
Weakness type
CWE-20 · Improper Input Validation
CVE
CVE-2024-13666
View all Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder vulnerabilities

At a glance

CVE-2024-13666 is a medium-severity Improper Input Validation vulnerability in the Fluent Forms WordPress plugin, affecting versions <= 5.2.12. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 6.0.0; sites on affected versions should update now. Disclosed March 2025, reported by shaman0x01.

Vulnerability Overview

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to IP Address Spoofing in all versions up to, and including, 5.2.12 due to insufficient IP address validation and use of user-supplied HTTP headers as a primary method for IP retrieval. This makes it possible for unauthenticated attackers spoof their IP address and submit forms that may have IP-based restrictions.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-20: Improper Input Validation

Reaching this weakness in Fluent Forms <= 5.2.12 takes a caller who can reach the endpoint. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.

The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Fluent Forms the fix is 6.0.0: builds <= 5.2.12 are affected, anything from 6.0.0 onward is not.

Remediation

Update to version 6.0.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Fluent Forms: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Fluent Forms 6.0.0 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-13666https://www.wordfence.com/threat-intel/vulnerabilities/id/e06fe8e4-e27a-4492-b175-3b0846e4cf10https://nvd.nist.gov/vuln/detail/CVE-2024-13666

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C