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CVE-2026-15827— GutenKit <= 2.4.12 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Mailchimp REST Endpoints

Quick assessment

Affected
ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress GutenKit是WordPress基金会的一款Gutenberg块编辑器页面构建工具。 WordPress GutenKit 2.4.12及之前版本存在授权问题漏洞，该漏洞源于对/wp-json/gutenkit/v1/mailchimp/get/lists和/wp-json/gutenkit/v1/mailchimp/get/interests REST API端点缺少权限检查，可能导致未经身份验证的攻击者检索私人Mailchimp受众配置信息。

CVSS 5.3 · Medium EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor ≤ 2.4.12 affected
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I. Basic Information for CVE-2026-15827

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
GutenKit <= 2.4.12 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Mailchimp REST Endpoints
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress GutenKit 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress GutenKit是WordPress基金会的一款Gutenberg块编辑器页面构建工具。 WordPress GutenKit 2.4.12及之前版本存在授权问题漏洞，该漏洞源于对/wp-json/gutenkit/v1/mailchimp/get/lists和/wp-json/gutenkit/v1/mailchimp/get/interests REST API端点缺少权限检查，可能导致未经身份验证的攻击者检索私人Mailchimp受众配置信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ataurr GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor 0 ~ 2.4.12 -

II. Public POCs for CVE-2026-15827

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III. Intelligence Information for CVE-2026-15827

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Patches & Fixes for CVE-2026-15827 (5)

Security Blog Posts for CVE-2026-15827 (1)

Vendor Pages for CVE-2026-15827 (1)

Other References for CVE-2026-15827 (1)

IV. Related Vulnerabilities

Same product: GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
Same vendor: ataurr
Same weakness: CWE-862

V. Comments for CVE-2026-15827

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