alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-81735 UI-TARS-desktop mcp-http-server - Unauthenticated MCP Handshake Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/mcp"; nocase; http.request_body; content:"initialize"; nocase; fast_pattern; content:"jsonrpc"; nocase; classtype:attempted-admin; reference:cve,CVE-2026-81735; reference:url,https://www.exploit.observer/?keyword=CVE-2026-81735&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=ui-tars&match=exact; sid:1081401; rev:1;)