Cyber Resilience

CVE-2026-27438

CriticalRCE

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0037 29.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-27438 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 29.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-27438 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the ThemeREX Kingler WordPress theme, which allows Object Injection. This issue affects Kingler versions from n/a through <=1.7.

The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical), rated as AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Unauthenticated attackers with network access can exploit it with low complexity and no user interaction required, potentially achieving high impacts on confidentiality, integrity, and availability through malicious object injection via untrusted deserialization.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/kingler/vulnerability/wordpress-kingler-theme-1-7-php-object-injection-vulnerability?_s_id=cve.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in ThemeREX Kingler kingler allows Object Injection.This issue affects Kingler: from n/a through <= 1.7.

CWE(s)
CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Unauthenticated remote deserialization/object injection in public-facing WordPress theme directly enables exploitation of the exposed application (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-62368Shared CWE-502
CVE-2025-68903Shared CWE-502
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CVE-2025-54014Shared CWE-502
CVE-2026-22505Shared CWE-502
CVE-2025-53078Shared CWE-502
CVE-2026-43633Shared CWE-502
CVE-2025-60039Shared CWE-502
CVE-2026-25429Shared CWE-502
CVE-2025-7697Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires timely identification, reporting, and correction of the specific deserialization of untrusted data flaw in the Kingler WordPress theme.

SI-10 Information Input Validation good match
prevent

Enforces validation of untrusted network inputs to block malicious serialized data that enables object injection.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Provides vulnerability scanning of hosted applications like WordPress themes to identify the critical deserialization vulnerability.

References