CVE-2025-7955: RingCentral WordPress Auth Bypass Flaw

CVE-2025-7955 Overview

The RingCentral Communications plugin for WordPress contains a critical Authentication Bypass vulnerability due to improper validation within the ringcentral_admin_login_2fa_verify() function in versions 1.5 to 1.6.8. This vulnerability allows unauthenticated attackers to log in as any user, including administrators, by simply supplying identical bogus codes during the two-factor authentication verification process.

Critical Impact

Unauthenticated attackers can completely bypass authentication and gain access to any WordPress user account, including administrator accounts, leading to full site compromise.

Affected Products

• RingCentral Communications Plugin (rccp-free) versions 1.5 to 1.6.8
• WordPress sites using affected plugin versions
• Any WordPress user accounts protected by the vulnerable 2FA implementation

Discovery Timeline

• 2025-08-28 - CVE CVE-2025-7955 published to NVD
• 2025-08-29 - Last updated in NVD database

Technical Details for CVE-2025-7955

Vulnerability Analysis

This Authentication Bypass vulnerability (CWE-287) exists in the ringcentral_admin_login_2fa_verify() function, which is responsible for validating two-factor authentication codes during the login process. The flawed implementation fails to properly validate that the submitted 2FA code matches the expected code generated for the user. Instead, the function only checks if two submitted code values are identical to each other, rather than comparing the submitted code against the server-side generated authentication token.

This implementation flaw allows attackers to circumvent the entire 2FA protection mechanism. An attacker can submit any arbitrary value as both the "expected" and "submitted" code fields, and the function will accept this as a valid authentication, granting access to the targeted user account.

Root Cause

The root cause is improper validation logic in the ringcentral_admin_login_2fa_verify() function. The function compares user-supplied inputs against each other rather than validating the submitted code against a server-generated secret. This represents a fundamental misunderstanding of how two-factor authentication should be implemented, where the verification step must compare user input against a server-side generated time-based or challenge-response token.

Attack Vector

The attack can be executed remotely over the network without any prior authentication or user interaction. An attacker targets the WordPress login endpoint with the RingCentral plugin's 2FA verification mechanism. By intercepting or crafting requests to the ringcentral_admin_login_2fa_verify() function and supplying matching bogus values for both code fields, the attacker bypasses authentication entirely.

The attack flow involves:

1. Identifying a WordPress site using the vulnerable RingCentral Communications plugin
2. Initiating a login attempt for a target user (such as an administrator)
3. Submitting identical arbitrary values during the 2FA verification step
4. Gaining authenticated access to the target account

For technical implementation details, see the WordPress Plugin File and the WordPress Changeset Log.

Detection Methods for CVE-2025-7955

Indicators of Compromise

• Unexpected administrator or user logins from unfamiliar IP addresses or locations
• Multiple successful 2FA verification attempts with identical or suspicious code values in authentication logs
• New administrator accounts or privilege escalations not initiated by legitimate users
• Unauthorized modifications to WordPress content, themes, plugins, or settings

Detection Strategies

• Monitor WordPress authentication logs for successful logins that bypass expected 2FA validation patterns
• Implement web application firewall (WAF) rules to inspect 2FA verification requests for anomalous patterns
• Deploy file integrity monitoring on WordPress core files, plugin directories, and configuration files
• Review user session activity for accounts that authenticated without proper 2FA challenge completion

Monitoring Recommendations

• Enable detailed logging for all authentication events, including 2FA verification attempts
• Configure alerts for new administrator account creation or role changes
• Monitor for bulk content modifications or plugin installations following authentication events
• Implement real-time monitoring of the ringcentral_admin_login_2fa_verify() function calls and their parameters

How to Mitigate CVE-2025-7955

Immediate Actions Required

• Update the RingCentral Communications plugin to version 1.6.9 or later immediately
• Audit all WordPress user accounts for unauthorized access or privilege changes
• Review recent login activity and reset credentials for any accounts showing suspicious activity
• Temporarily disable the RingCentral Communications plugin if an immediate update is not possible

Patch Information

A security patch has been released to address this vulnerability. The fix is available in the WordPress Changeset Log. Users should update to the latest version of the plugin through the WordPress plugin repository. Additional details are available at the WordPress Plugin Developer Info page and the Wordfence Vulnerability Report.

Workarounds

• Disable the RingCentral Communications plugin entirely until the patch can be applied
• Implement additional authentication controls at the web server or reverse proxy level
• Restrict access to the WordPress admin area by IP address where feasible
• Deploy a Web Application Firewall (WAF) with rules to block malformed 2FA verification requests

# Configuration example - Restrict wp-admin access by IP in Apache
<Directory /var/www/html/wp-admin>
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Directory>