CVE-2025-5821 CRITICAL

CVE-2025-5821: Case Theme User <= 1.0.3 - Authentication Bypass via Social Login

Vendor Case-Themes
Product Case Theme User
Weakness CWE-288
Published August 23, 2025
Last update April 8, 2026

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

The Case Theme User plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.0.3. This is due to the plugin not properly logging in a user with the data that was previously verified through the facebook_ajax_login_callback() function. This makes it possible for unauthenticated attackers to log in as administrative users, as long as they have an existing account on the site which can easily be created by default through the temp user functionality, and access to the administrative user's email.

Explanation of Vulnerability in Simple Terms

02Summary

Case Theme User versions up to 1.0.3 contain an authentication bypass vulnerability. An attacker can gain unauthorized access to the site without valid credentials. The vulnerability requires no user interaction and can be exploited remotely. All confidentiality, integrity, and availability protections are compromised.

What an attacker can do

03Attacker Capabilities

Gain full unauthorized access to the site without valid login credentials.

Potential impact on your site

04Site Impact

Complete compromise of site security; attacker can read, modify, or delete all data and user accounts.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

August 23, 2025 CVE published
April 8, 2026 Record updated