What is the CVSS score of CVE-2026-39556?

CVE-2026-39556 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Konsept WordPress Theme are affected by CVE-2026-39556?

Organizations running Konsept WordPress theme versions 1.9 or earlier face exposure to unauthenticated attackers who can inject malicious code to gain complete control of their website.

How to fix or mitigate CVE-2026-39556?

24 hours: Inventory all WordPress installations and identify those running Konsept theme version 1.9 or earlier; assess data sensitivity of affected sites; prepare incident response procedures. 7 days: Implement interim protections including Web Application Firewall rules to block serialized object payloads, disable unnecessary PHP serialization functions in the theme, and isolate affected sites from sensitive backend systems; contact elated-themes for patch status and timeline. 30 days: Complete migration to an alternative actively-maintained WordPress theme or apply patched version if released; validate remediation before returning to production.

Konsept WordPress Theme CVE-2026-39556

HIGH

Deserialization of Untrusted Data (CWE-502)

2026-06-17 Patchstack

PHP Deserialization Konsept

8.1

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

8.1 HIGH

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

vuln.today AI

8.1 HIGH

Remote unauthenticated HTTP reach (AV:N/PR:N/UI:N); AC:H because exploitation depends on a usable POP gadget chain in the installed stack; full CIA impact via PHP object injection leading to RCE.

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

4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jun 17, 2026 - 14:35 vuln.today

DescriptionCVE.org

Unauthenticated PHP Object Injection in Konsept <= 1.9 versions.

AnalysisAI

Unauthenticated PHP Object Injection affects the Konsept WordPress theme (by elated-themes) in versions 1.9 and earlier, allowing remote attackers to inject crafted serialized PHP objects without authentication. Successful exploitation can lead to a full compromise of the WordPress site - high impact on confidentiality, integrity, and availability - though CVSS rates attack complexity as high, indicating non-trivial conditions are required. No public exploit identified at time of analysis.

Technical ContextAI

Konsept is a commercial WordPress theme distributed by elated-themes (CPE: cpe:2.3:a:elated-themes:konsept). The root cause is CWE-502: Deserialization of Untrusted Data. In PHP, calling unserialize() on attacker-controlled input instantiates arbitrary classes and triggers magic methods such as __wakeup() and __destruct(). When the theme or any loaded WordPress plugin contains a class whose magic methods perform sensitive operations (a 'POP gadget'), an attacker can chain those gadgets to achieve outcomes ranging from arbitrary file read/write to remote code execution. WordPress themes commonly expose this primitive through cookies, AJAX handlers, or theme options that pass user input into unserialize().

RemediationAI

No vendor-released patch identified at time of analysis; administrators should consult the Patchstack advisory (https://patchstack.com/database/wordpress/theme/konsept/vulnerability/wordpress-konsept-theme-1-9-php-object-injection-vulnerability) and the elated-themes vendor portal for a fixed release above 1.9. Until a patched version is published, deploy a WordPress WAF such as Patchstack or Wordfence with rules that block serialized PHP payloads (strings beginning with O:, a:, s:) on theme endpoints - be aware this may break legitimate features relying on serialization. As a stronger interim control, switch to an alternative theme or restrict access to wp-admin and theme AJAX handlers via IP allow-list at the web server (trade-off: blocks legitimate remote administration). Audit installed plugins and remove unused ones to shrink the pool of available POP gadgets, and rotate all WordPress secrets and database credentials if the site has been internet-exposed since theme installation.