HIGH 8.8 NVD
CVE-2026-89435
The Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Arbitrary Plugin Installation
The Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Arbitrary Plugin Installation in all versions up to, and including, 6.35 via the 'file_url' parameter parameter. This is due to insufficient URL prefix validation in validate_url_is_in_s3_bucket() and a permission callback that relies solely on a shared token obtainable by any user with the delegable frm_view_forms capability, without checking install_plugins or activate_plugins capabilities. This makes it possible for authenticated attackers, with subscriber-level access and above, to install arbitrary plugins on the server. Exploitation additionally requires that the site is free-only (Formidable Pro is NOT installed).
References
- https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAdd
- https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAdd
- https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAdd
- https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmApp
- https://plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/helpers/FrmAppHelp
This high severity vulnerability with a CVSS score of 8.8 was published on 2026-10-30 via NVD.
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