CVE-2026-66565Suited to automated attack · CISA

WordPress FC United theme <= 1.1.1 - PHP Object Injection vulnerability

CVSS score

9.8

EPSS probability

%0.3

Risk score

0.0

Published

3 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

WordPress FC United Theme PHP Object Injection Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

An unauthenticated PHP Object Injection vulnerability affects WordPress FC United theme versions 1.1.1 and prior. [S0] This security flaw is rated as critical. [S0]

Why does it matter?

It poses a severe threat to target systems due to its unauthenticated exploitability and high potential impact. [S0]

What should be done?

Monitor vendor security advisories for updates
Upgrade the theme version where applicable

Chain of evidence and sources2 verified claims

WordPress FC United teması sürüm 1.1.1 ve öncesi kimlik doğrulaması gerektirmeyen PHP Nesne Enjeksiyonu zaafiyetinden etkilenmektedir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Güvenlik açığı 9.8 CVSS taban puanı ile kritik olarak derecelendirilmiştir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-502

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-66565 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	axiomthemes	FC United	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
9.8	CVSS V31	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD
9.8	CVSS V3_1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-66565 is associated with the following CWEs:

CWE-502: Deserialization of Untrusted Data

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-66565 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://patchstack.com/database/wordpress/theme/fcunited/vulnerability/wordpress-fc-united-theme-1-1-1-php-object-injection-vulnerability?_s_id=cvevendor-advisory

CVSS Vector Radar Chart

9.8 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

axiomthemes

Weakness Type (CWE & CAPEC)

CWE-502

Similar Vulnerabilities

9.8

CVE-2025-60226

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