What is the CVSS score of EUVD-2026-43377?

EUVD-2026-43377 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: 0.6%.

Which versions of Kirki are affected by EUVD-2026-43377?

A critical object injection vulnerability in the Themeum Kirki customizer framework (versions through 6.0.12) affects WordPress sites using premium themes and plugins that bundle this toolkit.

How to fix or mitigate EUVD-2026-43377?

Within 24 hours, conduct an inventory of all WordPress themes and plugins deployed across your organization to identify which bundle Themeum Kirki through version 6.0.12 using automated scanning tools or manual vendor documentation review. Within 7 days, implement Web Application Firewall (WAF) rules to block suspicious serialization payloads, apply input validation and sanitization patches at the application layer if Kirki features are used, and restrict PHP serialization via php.ini configuration (disable_classes and disable_functions). Within 30 days, replace affected themes with patched or alternative versions, monitor access logs for exploitation attempts, and plan migration to themes not using vulnerable Kirki versions once vendor patches become available.

Kirki EUVD-2026-43377

| CVE-2026-57724 CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-07-13 Patchstack

Deserialization Kirki

9.8

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

9.8 CRITICAL

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

Primary rating from Vendor (Patchstack) · only source for this CVE.

CVSS VectorVendor: Patchstack

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

Analysis Generated

Jul 13, 2026 - 10:45 vuln.today

CVE Published

Jul 13, 2026 - 08:41 cve.org

CRITICAL 9.8

DescriptionCVE.org

Deserialization of Untrusted Data vulnerability in Themeum Kirki kirki allows Object Injection.This issue affects Kirki: from n/a through <= 6.0.12.

AnalysisAI

Object injection in the Themeum Kirki WordPress customizer framework (all versions through 6.0.12) allows attackers to abuse PHP deserialization of untrusted data (CWE-502), potentially leading to arbitrary object instantiation and, given a suitable POP gadget chain, remote code execution or full site compromise. Reported by Patchstack with a maximum CVSS 9.8 rating; no public exploit identified at time of analysis and the flaw is not listed in CISA KEV. …

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Recommended ActionAI

Within 24 hours, conduct an inventory of all WordPress themes and plugins deployed across your organization to identify which bundle Themeum Kirki through version 6.0.12 using automated scanning tools or manual vendor documentation review. …

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