gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth

Impact The power level parsing within gomatrixserverlib was failing to parse the "eventsdefault" key of the m.room.powerlevels event, defaulting the event default power level to zero in all cases. In rooms where the "eventsdefault" power level had been changed, this could result in events either...

GHSA-GRVV-H2F9-7V9C gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth

Impact The power level parsing within gomatrixserverlib was failing to parse the "eventsdefault" key of the m.room.powerlevels event, defaulting the event default power level to zero in all cases. In rooms where the "eventsdefault" power level had been changed, this could result in events either...

dendrite -- Incorrect parsing of the event default power level in event auth

Dendrite team reports: The power level parsing within gomatrixserverlib was failing to parse the "eventsdefault" key of the m.room.powerlevels event, defaulting the event default power level to zero in all cases. In rooms where the "eventsdefault" power level had been changed, this could result i...