Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join
, /send_leave
, and /invite
may not be correctly signed, or may not come from the expected servers.
{ "nvd_published_at": "2019-11-08T00:15:00Z", "cwe_ids": [ "CWE-347" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2022-09-19T19:32:08Z" }