GHSA-X958-RVG6-956W matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator

Summary matrix-sdk-crypto since version 0.8.0 up to 0.11.0 does not correctly validate the sender of an encrypted event. Accordingly, a malicious homeserver operator can modify events served to clients, making those events appear to the recipient as if they were sent by another user. Although the...