GutenKit <= 2.4.12 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Mailchimp REST Endpoints

Wordfence Intelligence   >   Vulnerability Database   >   GutenKit <= 2.4.12 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Mailchimp REST Endpoints
5.3
Missing Authorization
CVE CVE-2026-15827
CVSS 5.3 (Medium)
Publicly Published July 22, 2026
Last Updated July 23, 2026
Researcher Viet Anh Ngo

Description

The GutenKit Blocks plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the /wp-json/gutenkit/v1/mailchimp/get/lists and /wp-json/gutenkit/v1/mailchimp/get/interests REST API endpoints in versions up to, and including, 2.4.12. Both endpoints are registered with permission_callback => '__return_true', and their callbacks read the site's stored Mailchimp API key from the gutenkit_settings_list option and proxy Mailchimp audience/list, merge-field, interest-category, interest-name, and subscriber-count metadata back to the caller with no login, nonce, or capability check. This makes it possible for unauthenticated attackers to retrieve private Mailchimp audience configuration information from any site that has configured the GutenKit Mailchimp integration.

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Vulnerability Details for GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor

GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor

Software Type Plugin
Software Slug gutenkit-blocks-addon (view on wordpress.org)
Patched? Yes
Remediation Update to version 2.4.13, or a newer patched version
Affected Version
  • <= 2.4.12
Patched Version
  • 2.4.13

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# Title CVE ID CVSS Researchers Date
1 GutenKit <= 2.4.2 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2025-57900 6.4 Prissy September 22, 2025
2 GutenKit <= 2.2.2 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2025-46253 6.4 Khalid Yusuf April 22, 2025
3 GutenKit <= 2.1.0 - Unauthenticated Arbitrary File Upload CVE-2024-9234 9.8 Sean Murphy October 10, 2024
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