Unauthenticated PHP Object Injection in Flatastic Theme by PatchStack
CVE-2026-66672

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Flatastic
Vendor
CVE Published:
20 August 2026

What is CVE-2026-66672?

A vulnerability exists in the Flatastic Theme versions up to 2.0 that allows unauthenticated users to exploit PHP object injection. This security flaw could potentially allow malicious users to execute arbitrary code and gain unauthorized access to sensitive data, raising significant concerns for website owners using this theme. It is crucial for users to update to a secure version or implement alternative protective measures to prevent potential exploitation.

Affected Version(s)

Flatastic <= 2.0

References

https://patchstack.com/database/wordpress/theme/flatastic...
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

João Pedro S Alcântara (Kinorth) | Patchstack Bug Bounty Program
.