Controller A is sending a message to B1 asking for some confidential information about C1 (but C1 is not actually named - just "about your child" .
D E and F are copied in.
Message is misdirected to B2 (similar name - probably an autocomplete error). B2 doesn't realise this and replies to all with confidential info relating to C2.
Clearly A has committed a personal data breach in disclosing info relating to C1 to B2 but this, on the facts is trivial.
However A has caused (in root cause analysis terms) confidential and quite sensitive information about C2 to be disclosed to D E and F. In DP terms does A bear any responsibility? A was clearly not controller of the info when the error was made. But has A in some way asserted controllership over the remote info by asking for it to be sent in terms which were imprecise enough to mislead B2
Or does the subsequent 'error' by B2 break the chain of causation? B2 can hardly be blamed though.
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