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URL preview setting for a room is controllable by the homeserver
Package
matrix-react-sdk
Affected versions
<3.105.1
Patched versions
3.105.1
Impact
A malicious homeserver could manipulate a user's account data to cause the client to enable URL previews in end-to-end encrypted rooms, in which case any URLs in encrypted messages would be sent to the server.
Even if the CVSS score would be 4.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N) we classify this as High severity issue.
Patches
This was patched in matrix-react-sdk 3.105.1.
Workarounds
Deployments that trust their homeservers, as well as closed federations of trusted servers, are not affected.
References
N/A.