CVE-2025-62642: RBI Assistant Auth Bypass Vulnerability

CVE-2025-62642 Overview

CVE-2025-62642 is a Missing Authorization vulnerability (CWE-862) affecting the Restaurant Brands International (RBI) assistant platform. The platform's signup API, colloquially named "Anyone Can Join This Party," fails to properly verify user account creation requests. This flaw allows remote unauthenticated attackers to create arbitrary user accounts on the platform without any verification or authorization checks.

Critical Impact

Remote attackers can create unauthorized user accounts on the RBI assistant platform, potentially gaining access to internal systems used by Burger King, Tim Hortons, and Popeyes restaurant franchises without any authentication.

Affected Products

• RBI Restaurant Brands International Assistant (through 2025-09-06)

Discovery Timeline

• 2025-10-17 - CVE CVE-2025-62642 published to NVD
• 2025-10-31 - Last updated in NVD database

Technical Details for CVE-2025-62642

Vulnerability Analysis

This vulnerability stems from a fundamental missing authorization flaw in the RBI assistant platform's user registration API endpoint. The platform is designed to support Restaurant Brands International's various fast-food chains including Burger King, Tim Hortons, and Popeyes. The vulnerable signup API lacks any verification mechanism for account creation requests, meaning anyone on the internet can register accounts without providing proof of legitimacy or association with RBI.

The attack can be executed entirely over the network without requiring any prior authentication or user interaction. What makes this particularly severe is that the vulnerability has scope change implications—compromising the assistant platform could potentially impact connected systems and resources beyond the vulnerable component itself.

Root Cause

The root cause is CWE-862: Missing Authorization. The signup API endpoint does not implement any authorization checks to verify whether a user creation request should be permitted. There are no verification mechanisms such as email confirmation, domain validation, invitation tokens, or administrative approval workflows in place to prevent unauthorized account creation.

Attack Vector

The attack vector is network-based with low complexity requirements. An attacker can exploit this vulnerability by:

1. Identifying the RBI assistant platform's signup API endpoint
2. Crafting HTTP requests to the account creation endpoint
3. Submitting arbitrary user registration data without authentication
4. Gaining access to the platform with the newly created account

The vulnerability requires no privileges, no user interaction, and can be exploited remotely. Once an attacker creates an account, they may gain access to internal restaurant management functions, drive-thru systems, or other operational components accessible through the assistant platform.

According to the Malwarebytes Vulnerability Report, security researchers characterized this and related vulnerabilities in RBI platforms as "catastrophic." Additional technical details are available in the Bob Da Hacker Blog Post.

Detection Methods for CVE-2025-62642

Indicators of Compromise

• Unusual spikes in user account creation requests to the signup API endpoint
• Multiple account registrations originating from suspicious IP addresses or ranges
• Accounts created with email addresses from non-corporate or suspicious domains
• Login attempts from newly created accounts accessing sensitive platform functions

Detection Strategies

• Implement rate limiting monitoring on the user registration API endpoint
• Deploy web application firewall (WAF) rules to detect abnormal registration patterns
• Monitor authentication logs for newly created accounts accessing privileged functions
• Analyze account creation timestamps for automated or bulk registration attempts

Monitoring Recommendations

• Enable detailed logging on all user creation API endpoints
• Configure alerts for registration attempts from TOR exit nodes, VPNs, or known malicious IP ranges
• Monitor for accounts accessing internal restaurant management or drive-thru systems shortly after creation
• Implement anomaly detection for registration request volumes and patterns

How to Mitigate CVE-2025-62642

Immediate Actions Required

• Audit all user accounts created since the vulnerability was discovered for legitimacy
• Disable or restrict public access to the signup API endpoint immediately
• Implement emergency authentication requirements for account creation
• Review access logs for any suspicious activity from newly created accounts
• Contact RBI for guidance on applying available security updates

Patch Information

Organizations should update the RBI Restaurant Brands International Assistant platform to a version released after 2025-09-06 that addresses this vulnerability. No vendor advisory URLs are currently available in the public CVE data. Affected organizations should contact Restaurant Brands International directly for patch availability and deployment guidance.

For additional context on the vulnerability disclosure, refer to the Yahoo News Article on Burger King Hack.

Workarounds

• Implement network-level access controls to restrict signup API access to trusted IP ranges only
• Deploy a web application firewall (WAF) to filter and inspect registration requests
• Add CAPTCHA or similar human verification mechanisms to the registration process
• Implement email domain whitelisting to only allow registrations from approved corporate domains
• Enable multi-factor authentication for all newly created accounts before granting platform access

# Example WAF configuration to restrict registration endpoint access
# Whitelist trusted IP ranges for signup API
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP_RANGE -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -m string --string "/api/signup" --algo bm -j DROP