CVE-2025-54001 CRITICAL

CVE-2025-54001: WordPress Classter theme <= 2.5 - PHP Object Injection vulnerability

Vendor Themerex

Product Classter

Weakness CWE-502 · Unsafe deserialization

Published March 5, 2026

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

Description

Deserialization of Untrusted Data vulnerability in ThemeREX Classter classter allows Object Injection.This issue affects Classter: from n/a through <= 2.5.

Key dates

Disclosure timeline

March 5, 2026 CVE published

April 28, 2026 Record updated