CVE-2026-39556
Deferred Deferred - Pending Action
BaseFortify

Publication date: 2026-06-17

Last updated on: 2026-06-17

Assigner: Patchstack

Description
Unauthenticated PHP Object Injection in Konsept <= 1.9 versions.
CVSS Scores
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Meta Information
Published
2026-06-17
Last Modified
2026-06-17
Generated
2026-06-17
AI Q&A
2026-06-17
EPSS Evaluated
N/A
NVD
CVE-2026-39556
EUVD
EUVD-2026-37687
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
konsept konsept to 1.9 (inc)
patchstack konsept to 1.9 (inc)
patchstack konsept 2.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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Compliance Impact

The vulnerability in the Konsept WordPress theme allows unauthenticated PHP Object Injection, which can lead to code execution, SQL injection, path traversal, or denial of service attacks. Such security weaknesses can result in unauthorized access to sensitive data or disruption of services.

Because of the potential for data breaches or service interruptions, this vulnerability could negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information and maintaining system integrity.

To maintain compliance, affected users should update to the patched version 2.0 immediately or apply recommended mitigations until the update is possible.

Executive Summary

CVE-2026-39556 is a high-priority PHP Object Injection vulnerability found in the WordPress Konsept Theme versions 1.9 and below. This flaw allows unauthenticated attackers to inject malicious PHP objects into the application.

Exploiting this vulnerability can enable attackers to perform code injection, SQL injection, path traversal, or cause denial of service, provided a suitable POP (Property Oriented Programming) chain exists.

Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, database compromise through SQL injection, unauthorized file system access via path traversal, and service disruption through denial of service attacks.

Given its high CVSS score of 8.1, it is highly likely to be exploited in widespread attacks targeting thousands of websites using the vulnerable theme.

If you are using Konsept Theme version 1.9 or below, your website is at risk until you update to version 2.0 or apply recommended mitigations.

Mitigation Strategies

The vulnerability in WordPress Konsept Theme versions 1.9 and below can be mitigated by updating the theme to version 2.0, where the issue has been patched.

If updating the theme immediately is not possible, it is recommended to apply Patchstack's mitigation rule until the update can be performed.

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