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High 7.5
Matrix Synapse Authorization Error
In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.
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High 7.5
Matrix Synapse Security Filtering Flaw
The on_get_missing_events function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.
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High 7.5
Matrix Synapse DoS
Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.