CVE-2026-12720Public exploitNetwork attack vector

Unauthenticated object injection via unrestricted unserialize

Published Jul 31, 2026 · Updated Jul 31, 2026

PHP object injection in Themeum Kirki before 6.0.13 allows remote attackers to instantiate arbitrary classes through stored form data. The frontend form REST route stores an attacker-controlled message in a visitor transient, and prepare_form_data_response later passes those bytes to unserialize() without an allowed_classes restriction. An administrator must review or export the form entry; code execution additionally requires a usable gadget chain in another plugin, a theme, or WordPress.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in Themeum Kirki before 6.0.13 allows remote attackers to instantiate arbitrary classes through stored form data. The frontend form REST route stores an attacker-controlled message in a visitor transient, and prepare_form_data_response later passes those bytes to unserialize() without an allowed_classes restriction. An administrator must review or export the form entry; code execution additionally requires a usable gadget chain in another plugin, a theme, or WordPress.

The record

CVE
CVE-2026-12720
Published
Jul 31, 2026
Updated
Jul 31, 2026
Vendor
Themeum
Product
Kirki
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Themeum · Kirkiversion=0 <6.0.13

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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