Unauthenticated Access Control Vulnerability in MailChimp Block Plugin by WordPress
CVE-2026-56063

8.3HIGH

Key Information:

Vendor

WordPress
Status
Mailchimp Block
Vendor
CVE Published:
26 June 2026

What is CVE-2026-56063?

The MailChimp Block plugin for WordPress versions up to 1.1.15 is susceptible to an unauthenticated broken access control vulnerability. This flaw allows attackers to exploit the plugin, potentially granting unauthorized access to sensitive features or data without proper authentication, which can lead to further attacks on the affected site.

Affected Version(s)

MailChimp Block <= 1.1.15

References

https://patchstack.com/database/wordpress/plugin/block-fo...
vdb-entry

CVSS V3.1

Score:
8.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Roll | Patchstack Bug Bounty Program
.