Unauthenticated PHP Object Injection Vulnerability in Windsor Theme by Patchstack
CVE-2026-66563

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Windsor
Vendor
CVE Published:
10 October 2026

What is CVE-2026-66563?

The Windsor theme by Patchstack, version 2.10 and earlier, is susceptible to an unauthenticated PHP Object Injection vulnerability. This flaw allows attackers to exploit object injection weaknesses in the application, potentially leading to unauthorized access and manipulation of the underlying application data. Such vulnerabilities are critical to address as they can be exploited without any user authentication, allowing a malicious actor to execute arbitrary code within the context of the targeted WordPress installation.

Affected Version(s)

Windsor <= 2.10

References

https://patchstack.com/database/wordpress/theme/windsor/v...
vdb-entry

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bonds | Patchstack Bug Bounty Program
.