What is the CVSS score of CVE-2026-27438?

CVE-2026-27438 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of ThemeREX Kingler are affected by CVE-2026-27438?

A critical deserialization vulnerability in ThemeREX Kingler (versions through 1.7) allows attackers to inject malicious objects, potentially leading to complete system compromise.

How to fix or mitigate CVE-2026-27438?

Within 24 hours: Identify all systems running Kingler and assess exposure; isolate affected instances if possible. Within 7 days: Implement WAF rules to block malicious serialized object patterns; disable Kingler's deserialization features if operationally feasible; consider migrating to an alternative theme. Within 30 days: Plan and execute full migration away from Kingler to a patched alternative; conduct forensic review for evidence of exploitation.

ThemeREX Kingler CVE-2026-27438

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-03-05 audit@patchstack.com

Deserialization

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 22, 2026 - 21:37 vuln.today

cvss_changed

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 06:16 nvd

CRITICAL 9.8

DescriptionCVE.org

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

AnalysisAI

Deserialization of untrusted data in Kingler (kingler) WordPress theme allows PHP Object Injection, potentially enabling remote code execution through POP chains.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send malicious serialized PHP object

Exploit

Plugin deserializes untrusted data

Execution

Instantiate arbitrary class

Impact

Execute injected code with plugin privileges

Access

Send malicious serialized PHP object

Exploit

Plugin deserializes untrusted data

Execution

Instantiate arbitrary class

Impact

Execute injected code with plugin privileges

Vulnerability AssessmentAI

Exploitation	ThemeREX Kingler plugin version ≤1.7 installed and activated on WordPress. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 9.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Attacker submits serialized PHP payload through kingler theme, triggering Object Injection that chains to file write or code execution via available POP gadgets.
Remediation	Update the theme. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify all systems running Kingler and assess exposure; isolate affected instances if possible. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-27438 vulnerability details – vuln.today

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ThemeREX Kingler CVE-2026-27438

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Unlock full vulnerability intelligence

Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

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External POC / Exploit Code