Fundamentos de la web
Session theft: account access without another password prompt
An authenticated session can become a separate credential worth protecting and revoking.
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The active session
After login, a service may accept a session identifier as evidence that later requests belong to the authenticated user. Stealing or misusing that identifier can allow access without repeating the original password flow.
The relevant question after compromise is therefore broader than whether someone knows the password. Which sessions remain valid? Can existing sessions approve sensitive operations? Does the service request fresh authentication for important changes?
Respond to the authority that was lost
Use the provider's established account settings to inspect and revoke sessions. If the device itself may be compromised, perform recovery through a trusted device. Repeatedly logging back into a hostile environment can expose replacement credentials.
For an investigation, distinguish a leaked password, a stolen session and a malicious extension with access inside the browser. Their symptoms can overlap, but the remediation differs. A report should identify the path observed and the evidence supporting it rather than calling every account takeover a password breach. See session cookies and incident response.