CVE-2026-24598: Multilanguage Plugin Auth Bypass Flaw

CVE-2026-24598 Overview

CVE-2026-24598 is a Missing Authorization vulnerability (CWE-862) affecting the Multilanguage plugin by BestWebSoft for WordPress. This security flaw allows attackers with low-level privileges to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to restricted functionality or sensitive information.

The vulnerability stems from improper access control implementation within the plugin, which fails to properly verify user authorization before allowing access to certain features or data. This type of Broken Access Control vulnerability is particularly concerning in WordPress environments where plugins often handle sensitive site configuration and multilingual content management.

Critical Impact
Authenticated attackers with minimal privileges can bypass authorization checks to access restricted plugin functionality, potentially exposing sensitive configuration data or enabling unauthorized modifications to multilanguage settings.

Affected Products

Multilanguage by BestWebSoft plugin versions up to and including 1.5.2
WordPress installations running vulnerable versions of the Multilanguage plugin

Discovery Timeline

2026-01-23 - CVE-2026-24598 published to NVD
2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-24598

Vulnerability Analysis

This Missing Authorization vulnerability exists due to insufficient access control checks within the Multilanguage plugin's functionality. The plugin fails to properly validate whether authenticated users have the appropriate permissions before granting access to certain administrative or privileged features.

The vulnerability requires network access and an authenticated user account, though only low-level privileges are needed to exploit it. No user interaction is required for exploitation, making it relatively straightforward for an attacker who has obtained basic WordPress credentials.

The impact is primarily confined to confidentiality, where an attacker could gain unauthorized read access to information that should be restricted to higher-privileged users. This could include plugin configuration settings, translation data, or other sensitive multilingual content management information.

Root Cause

The root cause of CVE-2026-24598 is the absence of proper authorization checks (CWE-862: Missing Authorization) in the Multilanguage plugin code. When users make requests to access certain plugin functionality, the application fails to verify that the requesting user has the necessary permissions or role to perform the requested action.

In WordPress plugin development, proper authorization typically requires checking user capabilities using functions like current_user_can() before executing sensitive operations. The absence of these checks allows users with subscriber or contributor-level access to potentially access administrator-only features.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated access to the WordPress installation with at least a low-privileged user account. The exploitation process involves:

Obtaining valid credentials for a low-privilege WordPress account (subscriber, contributor, or similar)
Authenticating to the WordPress installation
Accessing plugin endpoints or functionality that should require higher privileges
Bypassing the missing authorization checks to access restricted data or features

The vulnerability allows exploitation without any user interaction, meaning an attacker can independently exploit the flaw once they have obtained basic authentication credentials. The attack complexity is low, making it accessible to attackers with limited technical expertise.

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-24598

Indicators of Compromise

Unusual access patterns to Multilanguage plugin administrative endpoints from low-privileged user accounts
Unexpected queries or requests to plugin configuration pages by non-administrator users
Access logs showing subscriber or contributor accounts accessing plugin settings they should not have permission to view
Anomalous data access patterns in WordPress database logs related to the multilanguage plugin tables

Detection Strategies

Monitor WordPress access logs for requests to Multilanguage plugin endpoints from accounts with insufficient privileges
Implement WordPress security plugins that track privilege escalation attempts and unauthorized access to admin functions
Review user activity logs for low-privileged accounts accessing administrative plugin features
Deploy web application firewall (WAF) rules to detect and block suspicious requests to vulnerable plugin endpoints

Monitoring Recommendations

Enable detailed WordPress access logging to track all requests to plugin administrative functions
Configure security monitoring tools to alert on access attempts to Multilanguage plugin settings by non-administrator users
Regularly audit user permissions and access logs for signs of exploitation
Implement SentinelOne Singularity for endpoint detection and response to identify post-exploitation activity

How to Mitigate CVE-2026-24598

Immediate Actions Required

Update the Multilanguage by BestWebSoft plugin to the latest patched version immediately
Audit WordPress user accounts and remove unnecessary low-privileged accounts that could be used for exploitation
Review access logs for signs of previous exploitation attempts
Implement additional access controls at the web server or WAF level to restrict plugin administrative access

Patch Information

Organizations should update the Multilanguage by BestWebSoft plugin to a version newer than 1.5.2 once a patch is available from the vendor. Monitor the Patchstack vulnerability database and the BestWebSoft plugin page on WordPress.org for security updates.

Until a patch is available, consider the workarounds listed below to reduce risk exposure.

Workarounds

Temporarily deactivate the Multilanguage plugin if multilingual functionality is not critical to site operations
Restrict access to the WordPress admin dashboard to trusted IP addresses only
Implement a WordPress security plugin that enforces stricter capability checks on plugin functionality
Reduce the number of authenticated user accounts to minimize potential attack vectors

bash

# WordPress CLI command to list and audit user roles
wp user list --fields=ID,user_login,user_email,roles

# Restrict admin access by IP in .htaccess (Apache)
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from YOUR.TRUSTED.IP.ADDRESS
</Files>