alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-55872 GYM One - Stored XSS via Profile Fields"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/register"; nocase; http.request_body; content:"firstname"; nocase; content:"<script"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2026-55872; reference:url,https://www.exploit.observer/?keyword=CVE-2026-55872&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=gym-one&match=exact; sid:1084406; rev:1;)