Impact
Events retrieved from a remote homeserver using /get_missing_events did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint.
Note that this does not apply to events retrieved through other endpoints (e.g. /event, /state) as they have been correctly verified.
Homeservers that have federation disabled are not vulnerable.
Patches
The problem has been fixed in Dendrite 0.9.8.
Workarounds
There are no workarounds.
Special thanks
Tulir Asokan, who spotted the issue originally.