A WebSocket security assessment checks who may open a connection, which messages and subscriptions they may use, and when that access ends. A secure connection to the server does not by itself authorize a customer to receive another workspace’s live updates.
This matters for collaborative dashboards, support chats, dispatch boards, and applications that push changes without a page refresh. Include the persistent connection in the assessment alongside the ordinary HTTP API.
What is different about a WebSocket connection?
WebSockets allow a client and server to keep exchanging messages after the initial connection. OWASP’s WebSocket guidance calls for authentication, origin validation for browser connections, message-level authorization, and session handling throughout that connection’s life.
An initial successful handshake only establishes that the connection opened. The business still needs a rule for each subscription and action. Write that rule in terms a product owner can verify, such as “a dispatcher receives updates only for assigned depots.”
How do you test channel and subscription permissions?
In an illustrative dispatch application, create two depots, one test dispatcher per depot, and a synthetic delivery in each. Confirm that normal updates arrive at the intended dispatcher. Then attempt a subscription to the other depot using the second synthetic delivery as the marker.
Record the subscription request and the events actually received. Some systems acknowledge a subscription before checking it; others send an error but leave an older subscription running. Observe the connection over the agreed interval instead of treating one response as the whole result.
Repeat the case for a message that changes a record. Receiving and changing delivery information are separate privileges. Verify the stored delivery state after the attempted change.
Can another website open an authenticated connection?
Use a controlled browser page on an unrelated origin to test the intended origin policy. Record the browser, authentication method, cookies sent, and server decision. Cookie and browser settings affect the outcome, so do not infer an authenticated compromise from a connection opening without a usable session.
Origin validation helps govern browser use. It is not a substitute for authentication because a non-browser client can supply its own origin value. Keep those two checks separate in the report.
For mobile or service clients that legitimately do not send a browser origin, document the alternative authentication contract. An exception should have a defined client and purpose.
What happens when a user logs out or loses access?
Open the test dispatcher’s live board, remove their depot assignment, and cause another synthetic delivery update. Verify whether the existing connection still receives data. Repeat after logout and session expiry according to the product’s stated policy.
Define an acceptable removal interval with the business. Capture the last permitted event, the access change, and any later event. A browser page that visually logs out while its connection keeps receiving private updates does not demonstrate complete session termination.
How can availability limits be verified safely?
Agree small test limits for message size, subscription count, and idle connections in a designated environment. Exercise the limit and one ordinary request after it. The useful outcome is a controlled rejection with the legitimate service still available, not an uncontrolled production load test.
Ask which logs connect a message to a user and a subscription. Avoid recording full chat transcripts just to prove that a permission decision occurred.
For a Ceron assessment, include the live endpoint, supported clients, roles, and removal policy in scope. Application audit logs help define investigation evidence, and session revocation covers the wider account lifecycle. The dispatch workflow is illustrative.
