Formidable Forms <= 6.3 - Authenticated (Subscriber+) Arbitrary Plugin Installation and Activation

6.5
Missing Authorization
CVE CVE-2023-2877
CVSS 6.5 (Medium)
Publicly Published May 31, 2023
Last Updated January 22, 2024
Researcher Alex Sanford

Description

The Formidable Forms plugin for WordPress is vulnerable to unauthorized arbitrary plugin installation and activation due to a missing capability check on the screen_page() and can_install_addon_api() functions in versions up to, and including, 6.3. This makes it possible for authenticated attackers, with minimal permissions such as subscribers to retrieve a valid token from the welcome page, and then subsequently install and activate arbitrary plugins onto the site utilizing that key. This can easily be leveraged by attackers to achieve remote code execution as they simply need to install another plugin with a vulnerability or functionality that will aid in further exploitation.

Wordfence blocked 789 attacks targeting this vulnerability in the past 24 hours.

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Vulnerability Details for Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More

Software Type Plugin
Software Slug formidable (view on wordpress.org)
Patched? Yes
Remediation Update to version 6.3.1, or a newer patched version
Affected Version
  • < 6.3.1
Patched Version
  • 6.3.1

Recent vulnerabilities in Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More

# Title CVE ID CVSS Researchers Date
1 Formidable Forms <= 6.28 - Unauthenticated Payment Amount Manipulation via 'item_meta' Parameter CVE-2026-2888 5.3 Michael Iden (Mickhat) March 12, 2026
2 Formidable Forms <= 6.28 - Missing Authorization to Unauthenticated Payment Integrity Bypass via PaymentIntent Reuse CVE-2026-2890 7.5 Andrés Cruciani March 12, 2026
3 Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder <= 6.16.1.2 - Reflected Cross-Site Scripting via Custom HTML Form Parameter CVE-2024-11188 6.1 mikemyers November 22, 2024
4 Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder <= 6.14 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2024-9768 4.4 Krugov Artyom October 31, 2024
5 Formidable Forms <= 6.11.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting CVE-2024-6725 4.9 zer0gh0st July 30, 2024
6 Formidable Forms <= 6.7.2 - Cross-Site Request Forgery to Stored Cross-Site Scripting CVE-2024-0660 6.1 Webbernaut January 26, 2024
7 Formidable Forms <= 6.7 - HTML Injection CVE-2023-6830 6.5 drop January 8, 2024
8 Formidable Forms <= 6.7 - Authenticated (Administrator+) Stored Cross-Site Scripting CVE-2023-6842 4.4 drop January 8, 2024
9 Formidable Forms <= 6.1.2 - Unauthenticated PHP Object Injection CVE-2023-1405 9.8 Nguyen Huu Do April 6, 2023
10 Formidable Forms <= 6.0.1 - IP Spoofing via HTTP header CVE-2023-0816 5.3 Daniel Ruf March 6, 2023

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