alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS SEPPmail Gateway GINA v2 Arbitrary File Read (CVE-2026-44127)"; flow:established,to_server; http.uri; content:"/api.app/attachment/preview?"; fast_pattern; content:"identifier|3d|"; pcre:"/^[^&]*?(?:\x2f|\x25(?:25)?2[fF])/R"; http.method; content:"GET"; reference:url,labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/; reference:cve,2026-44127; classtype:web-application-attack; sid:2069391; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_05_22, cve CVE_2026_44127, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_05_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)