Formidable Forms <= 5.5.4 - Authenticated (Admin+) Server-Side Request Forgery
Strategic Overview
- Status
- Patched in 5.5.5
- Affected Plugin
- Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
- Affected Version
<= 5.5.4- CVSS
- 4.7Medium
- Weakness type
- CWE-918 · Server-Side Request Forgery (SSRF)
- CVE
CVE pending
At a glance
This record tracks a medium-severity Server-Side Request Forgery (SSRF) vulnerability in the Formidable Forms WordPress plugin, affecting versions <= 5.5.4. It carries a CVSS score of 4.7 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 5.5.5; sites on affected versions should update now. Disclosed December 2022.
Vulnerability Overview
The Formidable Form Builder plugin for WordPress is vulnerable to Server-Side Request Forgery in versions up to, and including, 5.5.4 due to insufficient URL restrictions on the 'plugin' parameter passed to the the install_addon function. This makes it possible for authenticated users, with administrative privileges, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
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 interaction from a victim user.
CWE-918: Server-Side Request Forgery (SSRF)
Formidable Forms <= 5.5.4 carries this weakness at plugin, and reaching it takes an account at Admin level or above. Server-side request forgery means the application fetches a URL supplied by the caller, turning the server into a proxy for requests the attacker could not make directly.
The request originates from inside the hosting network, which is how these flaws reach cloud metadata endpoints, internal admin panels and services that trust local traffic. For Formidable Forms the fix is 5.5.5: builds <= 5.5.4 are affected, anything from 5.5.5 onward is not.
Remediation
Update to version 5.5.5, or a newer patched version
How does WordSec protect against this?
An attacker needs Admin 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: Formidable Forms 5.5.5 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
- 9.8CVE-2023-1405: Formidable Forms <= 6.1.2 PHP Object Injection
CVE-2023-1405 - 9.8CVE-2019-15780: Formidable Form Builder <= 4.02 PHP Object Injection
CVE-2019-15780 - 9.6CVE-2021-24884: Formidable Form Builder <= 4.09.04 Stored XSS
CVE-2021-24884 - 9.1Formidable Form Builder <= 2.0.21 Missing Authorization Checks
- 8.8CVE-2014-9309: Formidable Form Builder <= 1.07.11 SQL Injection
CVE-2014-9309 - 8.6Formidable Form Builder < 2.05.03 SQL Injection
- 8.3CVE-2017-20192: Formidable Form Builder < 2.05.03 Stored XSS
CVE-2017-20192 - 7.5CVE-2026-2890: Formidable… Unauthenticated Payment Integrity Bypass
CVE-2026-2890
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C