After changing the options weechat.network.gnutls_ca_system or weechat.network.gnutls_ca_user, the TLS verification function is lost.
Consequently, any connection to a server with TLS is made without verifying the certificate, which could lead to a man-in-the-middle attack.
Connection to IRC servers with TLS is affected, as well as any connection a server made by a plugin or a script using the function hook_connect.
After changing options weechat.network.gnutls_ca_system or weechat.network.gnutls_ca_user, you must restart WeeChat.
WSA-2021-1: [Relay] Crash on malformed websocket frame in relay plugin.
A crash happens when decoding a malformed websocket frame in relay plugin.
This happens even if a password is set in relay plugin, the malformed websocket frame can be received before the authentication of the client.
There are multiple ways to mitigate this issue:
Rremove all relays, see: /help relay
Unload relay plugin with command: /plugin unload relay and see: /help weechat.plugin.autoload
Secure relay to allow only some trusted IP addresses, see: /help relay.network.allowed_ips