CVE-2026-15827: CWE-862 Missing Authorization in ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
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.
AI Analysis
Technical Summary
The GutenKit Blocks plugin for WordPress exposes two REST API endpoints (/wp-json/gutenkit/v1/mailchimp/get/lists and /wp-json/gutenkit/v1/mailchimp/get/interests) that are registered with a permission callback that always returns true, effectively disabling access control. These endpoints return the site's stored Mailchimp API key and proxy Mailchimp audience/list, merge-field, interest-category, interest-name, and subscriber-count metadata to the caller. This missing authorization (CWE-862) allows unauthenticated attackers to access private Mailchimp configuration information on affected sites running versions up to and including 2.4.12.
Potential Impact
An unauthenticated attacker can retrieve private Mailchimp audience configuration data, including the stored Mailchimp API key and related metadata. This exposure could lead to further abuse of the Mailchimp integration or leakage of sensitive marketing data. The vulnerability does not allow modification or denial of service but compromises confidentiality of Mailchimp-related data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the affected REST API endpoints or disable the GutenKit Mailchimp integration if possible. Monitor vendor channels for updates and apply official patches once released.
CVE-2026-15827: CWE-862 Missing Authorization in ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
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.
CVSS v3.1
Score 5.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The GutenKit Blocks plugin for WordPress exposes two REST API endpoints (/wp-json/gutenkit/v1/mailchimp/get/lists and /wp-json/gutenkit/v1/mailchimp/get/interests) that are registered with a permission callback that always returns true, effectively disabling access control. These endpoints return the site's stored Mailchimp API key and proxy Mailchimp audience/list, merge-field, interest-category, interest-name, and subscriber-count metadata to the caller. This missing authorization (CWE-862) allows unauthenticated attackers to access private Mailchimp configuration information on affected sites running versions up to and including 2.4.12.
Potential Impact
An unauthenticated attacker can retrieve private Mailchimp audience configuration data, including the stored Mailchimp API key and related metadata. This exposure could lead to further abuse of the Mailchimp integration or leakage of sensitive marketing data. The vulnerability does not allow modification or denial of service but compromises confidentiality of Mailchimp-related data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the affected REST API endpoints or disable the GutenKit Mailchimp integration if possible. Monitor vendor channels for updates and apply official patches once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-15T14:14:31.883Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a61dd649c2644c7f8c8ebdf
Added to database: 07/23/2026, 09:22:44 UTC
Last enriched: 07/23/2026, 09:39:23 UTC
Last updated: 07/24/2026, 02:35:18 UTC
Views: 11
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.