CVE-2025-8342 Overview
CVE-2025-8342 is an authentication bypass vulnerability affecting the WooCommerce OTP Login With Phone Number, OTP Verification plugin for WordPress. The vulnerability exists due to insufficient empty value checking in the lwp_ajax_register function in all versions up to and including 1.8.47. This security flaw allows unauthenticated attackers to bypass OTP verification and gain administrative access to any user account with a configured phone number by exploiting improper Firebase API error handling when the Firebase API key is not configured.
Critical Impact
Unauthenticated attackers can bypass OTP verification to gain administrative access to WordPress user accounts, potentially leading to complete site compromise.
Affected Products
- WooCommerce OTP Login With Phone Number plugin versions up to and including 1.8.47
- WordPress installations using the vulnerable plugin with phone number authentication
- Sites with unconfigured or improperly configured Firebase API keys
Discovery Timeline
- 2025-08-15 - CVE-2025-8342 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-8342
Vulnerability Analysis
This authentication bypass vulnerability (CWE-862: Missing Authorization) stems from improper validation of empty values within the lwp_ajax_register function. The vulnerable code paths are located at lines 4358 and 4373 of the login-with-phonenumber.php file. When the Firebase API key is not configured on the target WordPress installation, the plugin fails to properly handle Firebase API error responses, creating a condition where OTP verification can be completely bypassed.
The attack can be executed over the network without requiring any prior authentication or user interaction. However, successful exploitation depends on specific conditions—namely, that the target site has the Firebase API key unconfigured or misconfigured—which introduces complexity to the attack.
Root Cause
The root cause of this vulnerability is insufficient empty value checking in the authentication flow. The lwp_ajax_register function does not properly validate authentication tokens or OTP responses when the Firebase API returns an error due to missing API key configuration. This allows attackers to submit authentication requests that bypass the intended OTP verification process entirely.
Attack Vector
The attack is network-based and targets WordPress sites running vulnerable versions of the WooCommerce OTP Login plugin. An attacker can exploit this vulnerability by:
- Identifying a WordPress site using the vulnerable plugin version
- Determining whether the Firebase API key is configured (error responses may reveal this)
- Sending crafted authentication requests to the lwp_ajax_register AJAX endpoint
- Exploiting the improper error handling to bypass OTP verification
- Gaining access to user accounts, including administrative accounts, that have phone numbers configured
The vulnerability is particularly dangerous because it can lead to complete administrative access without requiring any credentials or OTP codes.
Detection Methods for CVE-2025-8342
Indicators of Compromise
- Unexpected successful login events without corresponding OTP verification logs
- Multiple failed authentication attempts followed by successful logins to high-privilege accounts
- Authentication requests to the lwp_ajax_register endpoint with empty or malformed OTP values
- Unusual user account activity following unexplained authentication events
Detection Strategies
- Monitor AJAX requests to /wp-admin/admin-ajax.php with action parameter lwp_ajax_register for suspicious patterns
- Implement logging for all authentication bypass attempts and Firebase API error responses
- Review WordPress access logs for repeated authentication endpoint requests from unknown IP addresses
- Deploy web application firewall (WAF) rules to detect and block exploitation attempts targeting this endpoint
Monitoring Recommendations
- Enable verbose logging for the WooCommerce OTP Login plugin to capture all authentication events
- Configure alerts for administrative account logins that occur without corresponding OTP verification records
- Monitor for Firebase API configuration errors that could indicate exploitation preconditions
- Implement real-time detection for anomalous authentication patterns targeting phone-number-based login endpoints
How to Mitigate CVE-2025-8342
Immediate Actions Required
- Update the WooCommerce OTP Login With Phone Number plugin to version 1.8.48 or later immediately
- Audit all user accounts with administrative privileges for unauthorized access or configuration changes
- Verify that the Firebase API key is properly configured in the plugin settings
- Review authentication logs for signs of exploitation prior to patching
Patch Information
The vulnerability has been addressed in the plugin update. The security fix can be reviewed in the WordPress Plugin Changeset. Additional technical analysis is available from Wordfence Vulnerability Analysis. The vulnerable code sections are documented at line 4358 and line 4373 of the plugin source.
Workarounds
- Ensure the Firebase API key is properly configured to prevent the error handling bypass condition
- Temporarily disable the OTP login functionality until the patch can be applied
- Implement additional authentication controls such as IP-based restrictions for administrative accounts
- Consider using a web application firewall to block suspicious requests to the vulnerable AJAX endpoint
# Configuration example
# Verify plugin version in WordPress CLI
wp plugin list | grep login-with-phone-number
# Update the vulnerable plugin
wp plugin update login-with-phone-number
# Verify the update was successful
wp plugin get login-with-phone-number --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
