CVE-2025-62650 is a high severity (CVSS 8.3) flaw in the Restaurant Brands International (RBI) assistant platform, which relies on client side authentication for its diagnostic screen (CWE-603). The record covers the platform through 2025-09-06. It is a hosted service, so no customer patch exists to apply.
What's affected
The record names one product, the Restaurant Brands International assistant platform, and says it is affected through 2025-09-06. There are no package versions, because this is a hosted web platform run by the vendor and not software that customers install.
Press coverage cited in the record, a Malwarebytes article from 9 September 2025, reports that two researchers described problems across assistant platforms for several RBI brands, and says the company fixed the issues the same day. I treat that as a media report and not as vendor confirmation, and I have not repeated any of its specifics that go beyond this CVE.
How to check if you're exposed
If you are an RBI customer or franchise operator, there is nothing to install. Ask your RBI contact whether the diagnostic screen issue is closed and whether any local credentials need to change.
For everyone else, the useful check is on your own applications. Search for places where an interface is hidden or protected only by something the browser enforces:
- Admin or diagnostic pages whose access depends on a JavaScript check, a hidden menu item or a flag in local storage.
- API endpoints that return data to any caller who skips the front end.
- Login flows where the server accepts a request without confirming the session itself.
A quick test is to call the backend endpoints directly, without the front end, using an account that should not have access, and confirm the server refuses.
What to do now
- If you operate under RBI brands, ask RBI whether the issue is closed and whether you need to rotate any credentials.
- List every admin, debug and diagnostic screen in your own applications.
- For each one, confirm the server checks identity and role on every request, not the browser.
- Remove diagnostic screens from production builds, or put them behind network controls as well as server side authentication.
- Add an automated authorization test that calls privileged endpoints without a valid session and expects a refusal.
Why it matters
Client side authentication means the decision about who gets in is made by code running on the user machine. Anyone can read, change or skip that code, so it protects nothing. CWE-603 names this exact mistake. The server must make the decision on every request.
The weakness is common in internal tools and in quickly built front ends, where the page hides a menu and the team treats that as access control. It is fixed by moving the check to the server and by removing screens that should not exist in production.
The record does not mark this CVE as CISA Known Exploited. The news coverage describes researcher findings, and I do not claim exploitation by attackers.
Quick check
Do I need to patch anything for CVE-2025-62650?
No. It is a hosted platform and the record lists no installable version. Customers should ask the vendor about status.
How do I tell client side checks from real access control?
Call the backend directly without the front end. If the server returns restricted data to an unauthorized caller, the control exists only in the browser.
Sources
Last reviewed: 18 October 2026.
