CVE-2026-18328

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

The Forminator Forms plugin for WordPress up to version 1.57.0.1 is vulnerable to Stored Cross-Site Scripting via Rich-Text Textarea Field. Insufficient input sanitization and output escaping allow unauthenticated attackers to inject arbitrary web scripts that execute when a user accesses an injected page. Exploitation requires the targeted Textarea field to have the Rich-Text editor option enabled.

The Forminator Forms WordPress plugin before version 1.57.1 does not verify that site registration is enabled on the network before creating a site signup. This allows unauthenticated visitors to create a new site on a WordPress multisite network and gain administrator privileges on it.

The Forminator Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Radio Field (Save and Continue Draft) in all versions up to, and including, 1.57.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable because the Save-and-Continue draft submission AJAX endpoint is registered as nopriv, allowing unauthenticated attackers to bypass radio field option-membership validation and persist a crafted payload that, when rendered on the Submissions admin page, is auto-executed via the bundled Inputmask library's data-attribute callback binding.

The Forminator Forms WordPress plugin before version 1.57.0.7 does not consistently enforce role restrictions on registration forms. Users with form-building permissions can configure a form that assigns the administrator role to any visitor who registers through it.

The Forminator Forms WordPress plugin before version 1.57.0.5 does not restrict a network-wide setting to network administrators. An administrator of any single site on a multisite network can execute arbitrary code across the entire network.

The Forminator Forms plugin for WordPress up to version 1.55.0.2 is vulnerable to Insecure Direct Object Reference via the 'draft' parameter. Unauthenticated attackers can enumerate sequential entry IDs and read other users' saved draft data, including names, emails, phone numbers, and message content, when the 'Save and Continue' feature is enabled.

The Forminator Forms plugin for WordPress up to version 1.56.1 is vulnerable to Stored Cross-Site Scripting via Forged Upload Record via Select Field due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts that execute when a user accesses an injected page.