alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-56845 Rocket.Chat - Local File Inclusion Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/custom-sounds/"; nocase; fast_pattern; pcre:"/\/custom-sounds\/.*(?:\.\.(?:%2f|%252f|\/|\\))/i"; classtype:web-application-attack; reference:cve,CVE-2026-56845; reference:url,https://www.exploit.observer/?keyword=CVE-2026-56845&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=rocketchat&match=exact; sid:1021800; rev:1;)