alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-75872 MailerUp - HTML Injection via subscription first_name"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/subscribe/"; nocase; fast_pattern; http.request_body; content:"first_name"; nocase; pcre:"/first_name[\x22'=:\s]{0,6}[^&,}\r\n]{0,120}(%3c|<)\s*\/?[a-z!]/i"; classtype:web-application-attack; reference:cve,CVE-2026-75872; reference:url,https://www.exploit.observer/?keyword=CVE-2026-75872&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=mailerup&match=exact; metadata:signature_type network_only; sid:1079207; rev:1;)