What the vulnerability does
01Description
The Gutenberg Blocks with AI by Kadence WP plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.6.1. This is due to insufficient validation of the `endpoint` parameter in the `get_items()` function of the GetResponse REST API handler. The endpoint's permission check only requires `edit_posts` capability (Contributor role) rather than `manage_options` (Administrator). This makes it possible for authenticated attackers, with Contributor-level access and above, to make server-side requests to arbitrary endpoints on the configured GetResponse API server, retrieving sensitive data such as contacts, campaigns, and mailing lists using the site's stored API credentials. The stored API key is also leaked in the request headers.
Explanation of Vulnerability in Simple Terms
02Summary
Kadence Blocks versions 3.6.1 and earlier contain a server-side request forgery vulnerability. An authenticated user with low privileges can make the site send HTTP requests to internal or external systems on the attacker's behalf. This could expose internal services or be used to interact with external APIs without authorization. Update to a version newer than 3.6.1.
What an attacker can do
03Attacker Capabilities
Make the site send HTTP requests to internal or external systems on the attacker's behalf.
Potential impact on your site
04Site Impact
Authenticated users can probe internal infrastructure or interact with external services, potentially exposing sensitive data or misconfigured endpoints.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege authenticated account on the site.
Key dates
06Disclosure timeline
February 18, 2026
CVE published
April 8, 2026
Record updated
