alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS SmarterTools SmarterMail ConnectToHub Remote Code Execution (CVE-2026-24423)"; flow:established,to_server; http.uri; content:"/api/v1/settings/sysadmin/connect-to-hub"; fast_pattern; http.request_body; content:"|22|hubAddress|22 3a|"; content:"|3a 2f 2f|"; within:20; http.method; content:"POST"; reference:url,www.vulncheck.com/blog/smartermail-connecttohub-rce-cve-2026-24423; reference:cve,2026-24423; classtype:web-application-attack; sid:2068802; rev:1; metadata:affected_product SmarterTools_SmarterMail, attack_target Server, tls_state TLSDecrypt, created_at 2026_04_16, cve CVE_2026_24423, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_04_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)