Cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver.
System administrators are encouraged to upgrade to Synapse 1.95.1 as soon as possible.
The federation_domain_whitelist can be used to limit federation traffic with a homeserver.
{
"nvd_published_at": "2023-10-31T17:15:23Z",
"github_reviewed_at": "2023-10-31T20:29:49Z",
"cwe_ids": [
"CWE-200"
],
"severity": "MODERATE",
"github_reviewed": true
}