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Vulnerability record · CVE-2023-2877 · published 27 June 2023

CVE-2023-2877: Strategy11 formidable forms vulnerability

Strategy11 · Formidable Forms

The Formidable Forms WordPress plugin before 6.3.1 does not adequately authorize the user or validate the plugin URL in its functionality for installing add-ons. This allows a user with a role as low as Subscriber to install and activate arbitrary plugins of arbitrary versions from the WordPress.org plugin repository onto the site, leading to Remote Code Execution.

8.8 CVSS 3.1 High EPSS 22% · top 2.4%
8.8CVSS 3.1 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Formidable Forms WordPress plugin before 6.3.1 does not adequately authorize the user or validate the plugin URL in its functionality for installing add-ons. This allows a user with a role as low as Subscriber to install and activate arbitrary plugins of arbitrary versions from the WordPress.org plugin repository onto the site, leading to Remote Code Execution.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/33765da5-c56e-42c1-83dd-fcaad976b402 ExploitThird Party Advisory
https://wpscan.com/vulnerability/33765da5-c56e-42c1-83dd-fcaad976b402 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-45806Strategy11 formidable forms missing authorization vulnerabilityMissing Authorization vulnerability in Strategy11 Form Builder Team Formidable Forms allows Exploiting Incorrectly Configured Access Control Security…EPSS 0.52%7.5CVE-2023-1405Strategy11 formidable forms deserialization of untrusted data vulnerabilityThe Formidable Forms WordPress plugin before 6.2 unserializes user input, which could allow anonymous users to perform PHP Object Injection when a su…EPSS 0.70%6.1CVE-2024-11188Strategy11 formidable forms cross-site scripting vulnerabilityThe Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder plugin for WordPress is vulnerable to POST-B…EPSS 0.40%6.1CVE-2024-23522Strategy11 formidable forms cross-site scripting vulnerabilityImproper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Strategy11 Form Builder Team Formidable Forms allows C…EPSS 0.34%5.4CVE-2024-6725Strategy11 formidable forms cross-site scripting vulnerabilityThe Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder plugin for WordPress is vulnerable to Stored…EPSS 0.37%4.8CVE-2024-9768Strategy11 formidable forms cross-site scripting vulnerabilityThe Formidable Forms WordPress plugin before 6.14.1 does not sanitise and escape some of its settings, which could allow high privilege users such as…EPSS 0.43%4.3CVE-2024-0660Strategy11 formidable forms cross-site request forgery vulnerabilityThe Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder plugin for WordPress is vulnerable to Cross-Site Re…EPSS 0.21%

Source: NIST National Vulnerability Database (record CVE-2023-2877), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.