GutenKit <= 2.4.12 — Missing Authorization to Unauthenticated Sensitive Information Exposure via Mailchimp REST Endpoints
CVE-2026-15827Published · Updated Action summary
Affected: ≤2.4.12Update to 2.4.13 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-862 Missing Authorization
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor gutenkit-blocks-addon
- Affected≤ 2.4.12
- Patched in2.4.13
Update to 2.4.13 or newer.
You are affected if you run ≤ 2.4.12. Version 2.4.13 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 2.4.13, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Viet Anh Ngo.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
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| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via 'postBodyCss' ≤2.4.4Update to 2.4.5 | CVE-2026-2573 | |
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| Medium6.4 | Authenticated (Author+) Stored Cross-Site Scripting <2.5.0Update to 2.5.0 | CVE-2026-19697 | |
| Medium4.3 | Authenticated (Contributor+) Information Exposure ≤2.4.15Update to 2.5.0 | CVE-2026-19699 |
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Same weakness (Missing Authorization)
All Missing Authorization| Severity | Vulnerability | CVE | Published |
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| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
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Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
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Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.