CVE-2024-9528

Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.19 - Authenticated (Form Manager+) Stored Cross-Site Scripting

2024-10-04 00:00
Ivan Kuzymchak

Strategic Overview

Status
Patched in 5.1.20
Affected Plugin
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Affected Version
<= 5.1.19
CVSS
4.9Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2024-9528
View all Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder vulnerabilities

At a glance

CVE-2024-9528 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Fluent Forms WordPress plugin, affecting versions <= 5.1.19. It carries a CVSS score of 4.9 (reachable over the network). Exploitation requires an authenticated account at Form Manager level or above. The issue is fixed in version 5.1.20; sites on affected versions should update now. Disclosed October 2024, reported by Ivan Kuzymchak.

Vulnerability Overview

The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form label fields in all versions up to, and including, 5.1.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with access to edit forms (administrator by default), to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Fluent Forms <= 5.1.19 takes an account at Form Manager level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Fluent Forms the fix is 5.1.20: builds <= 5.1.19 are affected, anything from 5.1.20 onward is not.

Remediation

Update to version 5.1.20, or a newer patched version

How does WordSec protect against this?

An attacker needs Form Manager access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Fluent Forms 5.1.20 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-9528https://www.wordfence.com/threat-intel/vulnerabilities/id/4ed4dfee-5f14-47ce-abed-cd226c110665https://nvd.nist.gov/vuln/detail/CVE-2024-9528

Related records

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