CVE-2024-2771

Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.16 - Missing Authorization to Settings Update and Limited Privilege Escalation

2024-05-17 19:02
Tobias Weißhaar (kun_19)

Strategic Overview

Status
Patched in 5.1.17
Affected Plugin
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Affected Version
<= 5.1.16
CVSS
9.8Critical
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2024-2771
View all Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder vulnerabilities

At a glance

CVE-2024-2771 is a critical-severity Missing Authorization vulnerability in the Fluent Forms WordPress plugin, affecting versions <= 5.1.16. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 5.1.17; sites on affected versions should update now. Disclosed May 2024, reported by Tobias Weißhaar (kun_19).

Vulnerability Overview

The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress is vulnerable to privilege escalation due to a missing capability check on the /wp-json/fluentform/v1/managers REST API endpoint in all versions up to, and including, 5.1.16. This makes it possible for unauthenticated attackers to grant users with Fluent Form management permissions which gives them access to all of the plugin's settings and features. This also makes it possible for unauthenticated attackers to delete manager accounts.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-862: Missing Authorization

Reaching this weakness in Fluent Forms <= 5.1.16 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Fluent Forms the fix is 5.1.17: builds <= 5.1.16 are affected, anything from 5.1.17 onward is not.

Remediation

Update to version 5.1.17, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Fluent Forms 5.1.17 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-2771https://www.wordfence.com/threat-intel/vulnerabilities/id/071195d6-3452-4241-a8d3-92efc84e4850https://nvd.nist.gov/vuln/detail/CVE-2024-2771

Related records

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