CVE-2026-66565
Received Received - Intake

Unauthenticated PHP Object Injection in FC United

Vulnerability report for CVE-2026-66565, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-10

Last updated on: 2026-10-10

Assigner: Patchstack

Description

Unauthenticated PHP Object Injection in FC United <= 1.1.1 versions.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-10
Last Modified
2026-10-10
Generated
2026-10-11
AI Q&A
2026-10-11
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
axiomthemes FC United n/a

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the FC United WordPress theme versions 1.1.1 or lower. It allows attackers to inject malicious PHP objects into the application without authentication, potentially leading to remote code execution or other harmful actions on the server.

Detection Guidance

Detecting this vulnerability requires checking for the FC United WordPress theme version 1.1.1 or lower. Inspect your WordPress installation for the theme folder and verify the version in the style.css file. Look for unusual server behavior like unexpected PHP errors or unauthorized file modifications.

Impact Analysis

An attacker could exploit this to take full control of your website, steal sensitive data, or use it as a launch point for further attacks. The high CVSS score of 9.8 indicates it is easily exploitable and poses severe risks to unpatched systems.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA compliance requirements. Organizations may face legal penalties, data breach notifications, and reputational damage if exploited.

Mitigation Strategies

Immediately apply the mitigation rule provided by Patchstack to block attacks. Consider temporarily disabling the FC United theme if no official patch is available. Update the theme as soon as an official fix is released or seek help from a developer or hosting provider.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-66565. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart