CVE-2025-5060: Bravis User Plugin Auth Bypass Flaw

CVE-2025-5060 Overview

The Bravis User plugin for WordPress contains an Authentication Bypass vulnerability in all versions up to and including 1.0.1. This vulnerability stems from improper user authentication handling within the facebook_ajax_login_callback() function, where the plugin fails to correctly log in a user with data that was previously verified through Facebook authentication. This flaw enables unauthenticated attackers to log in as administrative users, provided they have an existing account on the site and access to the administrative user's email address.

Critical Impact

Unauthenticated attackers can bypass authentication and gain administrative access to WordPress sites running the vulnerable Bravis User plugin, potentially leading to complete site compromise.

Affected Products

• Bravis User plugin for WordPress version 1.0.1 and earlier
• WordPress sites using the Graviton Construction theme with the Bravis User plugin
• Any WordPress installation utilizing Facebook login functionality through the affected plugin

Discovery Timeline

• 2025-08-23 - CVE CVE-2025-5060 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-5060

Vulnerability Analysis

This vulnerability is classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel). The core issue lies in the plugin's Facebook authentication callback mechanism, where the verification process and the actual login process are not properly synchronized.

When a user authenticates via Facebook, the plugin verifies the user's credentials through the Facebook API. However, after this verification occurs, the plugin fails to properly associate the verified identity with the subsequent login action. This disconnect between verification and authentication creates a window of opportunity for attackers to manipulate the authentication flow.

The attack requires the attacker to know the email address of an existing administrative user on the target WordPress site. With this information, an attacker can exploit the flawed authentication logic to assume the identity of the administrative user without providing proper credentials.

Root Cause

The root cause of this vulnerability is improper implementation of the authentication flow in the facebook_ajax_login_callback() function. Specifically, the plugin does not adequately verify that the user being logged in matches the user whose credentials were verified through Facebook's OAuth process. This creates an authentication bypass where the verification step can be circumvented or manipulated, allowing unauthorized access to user accounts.

Attack Vector

The attack is network-based and can be performed by unauthenticated users. The attack requires:

1. Knowledge of an existing administrative user's email address on the target site
2. The target site must have the vulnerable Bravis User plugin installed and active
3. Facebook login functionality must be enabled on the site

An attacker would craft malicious requests to the facebook_ajax_login_callback() endpoint, manipulating the authentication flow to bypass the verification process. Since the plugin does not properly correlate the verified user data with the login action, an attacker can supply an administrator's email address to gain elevated privileges.

The vulnerability mechanism exploits the disconnect between Facebook OAuth verification and the WordPress user login process. The facebook_ajax_login_callback() function accepts user data but fails to ensure the authenticity of the login request matches the previously verified Facebook session, enabling identity spoofing.

Detection Methods for CVE-2025-5060

Indicators of Compromise

• Unusual login activity for administrative accounts, particularly those associated with Facebook authentication
• Multiple failed or successful authentication attempts originating from unfamiliar IP addresses targeting the Facebook login callback
• Administrative actions performed during timeframes when legitimate administrators were not active
• Unexpected changes to site settings, user accounts, or content following authentication events

Detection Strategies

• Monitor WordPress authentication logs for anomalous login patterns, especially related to social login callbacks
• Implement web application firewall (WAF) rules to detect and block suspicious requests to the facebook_ajax_login_callback() endpoint
• Configure alerts for administrative account logins from new devices or geographical locations
• Review access logs for repeated requests to Facebook authentication endpoints with varying user parameters

Monitoring Recommendations

• Enable detailed logging for all authentication events in WordPress, including social login callbacks
• Implement real-time alerting for administrative privilege escalation or new administrative user creation
• Deploy endpoint detection solutions capable of monitoring WordPress plugin activity
• Conduct periodic reviews of user account permissions and login history

How to Mitigate CVE-2025-5060

Immediate Actions Required

• Disable the Bravis User plugin immediately if running version 1.0.1 or earlier
• Review administrative account activity for signs of unauthorized access
• Audit all user accounts for unexpected privilege changes or newly created administrative accounts
• Consider temporarily disabling Facebook login functionality until a patched version is available
• Implement additional authentication controls such as two-factor authentication for administrative accounts

Patch Information

Organizations using the Bravis User plugin should check the ThemeForest Product Page for updated versions that address this vulnerability. Additionally, the Wordfence Vulnerability Report provides detailed information about the vulnerability and recommended actions.

Workarounds

• Disable the Bravis User plugin entirely until a security patch is released
• Remove or restrict access to Facebook authentication functionality through alternative security plugins
• Implement IP-based access restrictions for WordPress administrative functions
• Use a Web Application Firewall (WAF) to filter malicious requests targeting the vulnerable callback function
• Consider using alternative authentication plugins with verified security practices

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate bravis-user --path=/var/www/html/wordpress

# Verify plugin is deactivated
wp plugin list --status=inactive --path=/var/www/html/wordpress | grep bravis-user