CVE-2025-48336 CRITICAL

CVE-2025-48336: WordPress Course Builder < 3.6.6 - PHP Object Injection Vulnerability

Vendor Thimpress
Product Course Builder
Weakness CWE-502 · Unsafe deserialization
Published May 29, 2025
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

01Description

Deserialization of Untrusted Data vulnerability in ThimPress Course Builder course-builder allows Object Injection.This issue affects Course Builder: from n/a through < 3.6.6.

Explanation of Vulnerability in Simple Terms

02Summary

Course Builder versions 3.6.6 and earlier contain a deserialization vulnerability that allows unauthenticated attackers to run arbitrary code on the site. The vulnerability exists in how the plugin processes untrusted serialized data without proper validation. No user interaction is required; an attacker can exploit this remotely by sending a crafted request.

What an attacker can do

03Attacker Capabilities

Run arbitrary code on the site and take complete control of it.

Potential impact on your site

04Site Impact

Complete site compromise: attackers can steal data, modify content, install malware, or take the site offline.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

May 29, 2025 CVE published
April 28, 2026 Record updated