AI Score
Confidence
High
EPSS
Percentile
51.7%
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.
github.com/matrix-org/synapse/pull/3371
github.com/matrix-org/synapse/releases/tag/v0.31.1