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CVE-2026-15827

MEDIUM 5.3 CVSS 3.1
Published
July 23, 2026
Last modified
July 23, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-862
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Affected WordPress components

  • GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor Plugin · gutenkit-blocks-addon
    Confirmed match Active
    Up to and including 2.4.12
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor — Up to and including 2.4.12

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.11/includes/Routes/MailChimp.php#L141
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.11/includes/Routes/MailChimp.php#L17
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.11/includes/Routes/MailChimp.php#L43
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.11/includes/Routes/MailChimp.php#L62
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.6/includes/Routes/MailChimp.php#L141
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.6/includes/Routes/MailChimp.php#L17
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.6/includes/Routes/MailChimp.php#L43
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenkit-blocks-addon/tags/2.4.6/includes/Routes/MailChimp.php#L62
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&old=3618270%40gutenkit-blocks-addon&new=3618270%40gutenkit-blocks-addon
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/7430594c-3a71-4b24-875b-014e03be868f?source=cve
  • nvd.nist.gov Official NVD record