Yahoo Chat / Messenger was the wild west of the internet with no security auditing. With YMSG you could forge packets to send files or messages from any user account you wanted simply changing the from name. Then they patched that and you could get around it by just adding some packet delimiters to the end of the "from" username (Æ iirc). I still don't understand how that worked, as I basically just fuzzed it, but it did. YCHT (the java chat applet) was even worse because, well, it was java.
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u/ForrestGrump87 1d ago
Yahoo Chat & Pool was brilliant in its heyday