CVE-2025-62650: RBI Assistant Auth Bypass Vulnerability

CVE-2025-62650 Overview

CVE-2025-62650 is a critical authentication bypass vulnerability affecting the Restaurant Brands International (RBI) assistant platform. The platform, used by major fast-food chains including Burger King, Tim Hortons, and Popeyes, relies on client-side authentication for access to the diagnostic screen. This fundamental security flaw allows attackers to bypass authentication entirely by manipulating client-side controls, potentially gaining unauthorized access to sensitive diagnostic functions and backend systems.

Critical Impact

Attackers can bypass authentication controls entirely by manipulating client-side logic, gaining unauthorized access to diagnostic screens and potentially compromising point-of-sale and drive-thru systems across multiple major restaurant chains.

Affected Products

• RBI Restaurant Brands International Assistant (all versions through 2025-09-06)
• Drive-thru systems utilizing the RBI assistant platform
• Point-of-sale integration components connected to the RBI platform

Discovery Timeline

• 2025-10-17 - CVE-2025-62650 published to NVD
• 2025-10-31 - Last updated in NVD database

Technical Details for CVE-2025-62650

Vulnerability Analysis

This vulnerability represents a fundamental authentication design flaw categorized under CWE-603 (Use of Client-Side Authentication). The RBI assistant platform implements authentication logic on the client side rather than server side, meaning the security controls can be bypassed by an attacker who manipulates the client application directly. This allows unauthorized users to access diagnostic screens that should be restricted to authorized personnel only.

The diagnostic screen likely provides access to system configuration, debugging capabilities, and potentially sensitive operational data. According to security researchers who discovered the flaw, this vulnerability affects drive-thru systems at major fast-food chains including Burger King, Tim Hortons, and Popeyes, all of which are owned by Restaurant Brands International.

Root Cause

The root cause of this vulnerability is the improper implementation of authentication controls. The platform performs authentication validation on the client side rather than the server side, violating fundamental security principles. Client-side authentication can always be bypassed because attackers have full control over the client environment and can modify, intercept, or completely disable client-side security checks.

In a secure implementation, authentication should always be verified server-side where the attacker cannot manipulate the validation logic. The decision to use client-side authentication for the diagnostic screen represents a significant architectural security failure.

Attack Vector

The vulnerability is exploitable over the network without requiring any privileges or user interaction. An attacker can access the diagnostic screen by:

1. Intercepting and modifying authentication responses from the server
2. Manipulating local client-side variables or flags that control access
3. Bypassing JavaScript-based authentication checks in web-based interfaces
4. Directly accessing diagnostic endpoints without proper authentication tokens

Since authentication is enforced client-side, the server does not validate whether the user is actually authorized, allowing any attacker who can reach the platform to gain access to restricted functionality. The changed scope component in the CVSS vector indicates that successful exploitation can impact resources beyond the vulnerable component itself.

Detection Methods for CVE-2025-62650

Indicators of Compromise

• Unusual access patterns to diagnostic screen endpoints from unauthorized IP addresses
• Authentication-related HTTP responses being modified in transit (e.g., changing authenticated: false to authenticated: true)
• Direct access attempts to diagnostic URLs without preceding authentication flows
• Anomalous configuration changes originating from the diagnostic interface

Detection Strategies

• Implement server-side logging for all diagnostic screen access attempts regardless of client-side authentication state
• Monitor network traffic for manipulation of authentication responses using web application firewalls
• Deploy endpoint detection solutions to identify unauthorized access to RBI assistant platform components
• Audit access logs for diagnostic screen usage patterns that deviate from normal operational procedures

Monitoring Recommendations

• Enable comprehensive logging on all RBI assistant platform servers with particular attention to diagnostic endpoint access
• Configure alerts for diagnostic screen access outside of normal maintenance windows
• Implement network-level monitoring for traffic to and from RBI assistant platforms
• Review web application firewall logs for signs of response manipulation or authentication bypass attempts

How to Mitigate CVE-2025-62650

Immediate Actions Required

• Restrict network access to RBI assistant platforms to authorized IP addresses and VPN connections only
• Implement network segmentation to isolate drive-thru and point-of-sale systems from general network access
• Disable or restrict access to the diagnostic screen until a vendor patch is available
• Review audit logs for any signs of unauthorized diagnostic screen access

Patch Information

As of the last modification date of 2025-10-31, no official vendor patch has been publicly documented for this vulnerability. Organizations should monitor RBI's security communications and vendor channels for patch availability. In the interim, compensating controls should be implemented to reduce exposure.

For technical details and the original security research, refer to the Bob Da Hacker Blog Post and the Malwarebytes Blog on Vulnerabilities.

Workarounds

• Place RBI assistant platforms behind a VPN or other network access control that requires proper authentication before the platform can be reached
• Implement a web application firewall (WAF) with rules to block direct access to diagnostic endpoints
• Deploy network segmentation to ensure drive-thru systems cannot be accessed from untrusted networks
• Add server-side authentication checks as a compensating control if platform modifications are possible

# Example: Restrict diagnostic endpoint access via iptables
# Allow only authorized management subnet to access diagnostic ports
iptables -A INPUT -p tcp --dport 8443 -s 10.10.50.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -j DROP

# Log all access attempts to diagnostic endpoints
iptables -A INPUT -p tcp --dport 8443 -j LOG --log-prefix "RBI-DIAG-ACCESS: "