Unauthenticated PHP Object Injection in Fidalgo Theme by PatchStack
CVE-2026-39554

8.1HIGH

Key Information:

Vendor

WordPress
Status
Fidalgo
Vendor
CVE Published:
16 June 2026

What is CVE-2026-39554?

The Fidalgo theme versions up to 1.2.2 are susceptible to a PHP Object Injection vulnerability, allowing attackers to exploit this flaw without authentication. This can potentially lead to arbitrary code execution and manipulation of objects, posing a serious risk to site integrity. Users are strongly advised to update to a secure version to mitigate the effects of this vulnerability.

Affected Version(s)

Fidalgo <= 1.2.2

References

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

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Denver Jackson | Patchstack Bug Bounty Program
.