CVE-2025-62642 identifies a missing authorization vulnerability (CWE-862) in the Restaurant Brands International assistant platform, specifically in its signup API, which is described as an "Anyone Can Join This Party" endpoint. This API does not verify user account creation requests, allowing any remote unauthenticated attacker to create user accounts without restriction. The vulnerability affects all versions up to 2025-09-06, with no patch currently available. The CVSS 3.1 base score is 5.8, reflecting a medium severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and a scope change (S:C). The impact is limited to integrity (I:L) with no confidentiality or availability impact. The vulnerability could be exploited to create multiple unauthorized accounts, potentially enabling attackers to conduct fraudulent activities, spam, or gain footholds for further attacks within the platform. No known exploits are reported in the wild yet, but the vulnerability’s presence in a widely used restaurant assistant platform raises concerns about potential abuse. The lack of authentication on the signup API is a fundamental security flaw that undermines trust in the platform’s user management. Organizations relying on RBI’s platform should be aware of this risk and prepare to implement compensating controls until a vendor patch is released.

For European organizations, the primary impact of CVE-2025-62642 lies in unauthorized account creation on the RBI assistant platform, which could lead to fraudulent orders, abuse of loyalty programs, or manipulation of user-generated data. While the vulnerability does not directly compromise confidentiality or availability, the integrity of user accounts and associated transactions is at risk. This could result in financial losses, reputational damage, and operational disruptions, especially for restaurant chains and partners relying on the platform for customer engagement and order management. Additionally, attackers might use created accounts as stepping stones for social engineering or phishing campaigns targeting employees or customers. The medium severity rating indicates a moderate but tangible risk that should not be overlooked, particularly in countries with high RBI market penetration or where digital restaurant services are critical. The absence of known exploits suggests a window for proactive mitigation, but organizations must act swiftly to prevent potential abuse.

1. RBI should urgently implement strict authorization and verification controls on the signup API to ensure only legitimate users can create accounts, such as CAPTCHA, email or phone verification, and rate limiting. 2. Organizations using the RBI assistant platform should monitor account creation logs for unusual spikes or patterns indicative of automated or malicious signups. 3. Employ anomaly detection systems to flag suspicious user behaviors post-account creation, such as rapid order placements or unusual access times. 4. Restrict API access where possible using network segmentation or IP whitelisting to limit exposure. 5. Educate staff and customers about potential phishing or social engineering attempts stemming from unauthorized accounts. 6. Maintain up-to-date incident response plans to quickly address any abuse resulting from this vulnerability. 7. Engage with RBI for timely patch deployment and verify fixes through penetration testing. 8. Consider implementing multi-factor authentication (MFA) for sensitive operations within the platform to reduce the impact of unauthorized accounts.