Could a messaging account have been compromised?¶

Yes. Stolen credentials, intercepted authentication, malicious software or unauthorised linked sessions can let another person act through a messaging account. Compromise is a testable explanation, not a conclusion produced by denial alone.

Different routes leave different traces¶

Phishing or password reuse may create unfamiliar logins. Stolen verification codes, SIM-related interference or temporary access to an unlocked phone may support account takeover or device linking. Recovery changes, password resets, new-device alerts, unusual session locations and loss of access can mark the sequence.

Known sharing or delegated access may explain the same account activity without a technical compromise. Identify the claimed route and whether it could perform the disputed action at the relevant time.

Preserve security state before remediation¶

Capture linked sessions, security emails and notifications, login records, recovery details, account changes and disputed message times before passwords are reset or sessions revoked where operationally safe. Examine provider and endpoint evidence together, including the suspected linked device where available.

Compare the compromise theory with possession, account history and the user's conduct. Record evidence that supports and weakens it. If urgent remediation changes the state, document the risk, decision and resulting events.