CVE Catalog

CVE-2026-15827

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.54%

42th percentile - higher than 42% of all known CVEs

Summary

Missing access control in the GutenKit Blocks plugin for WordPress (up to version 2.4.12). Unauthenticated attackers can retrieve private Mailchimp configuration data (lists, fields, metadata) via REST API endpoints.

Risk Assessment

Leakage of sensitive marketing and Mailchimp configuration data, potentially compromising privacy and communication strategy.

Recommendation

Update the GutenKit Blocks plugin to the latest version.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS