alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-54339 Glean - Server-Side Request Forgery via feeds discover feed_url"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/feeds/discover"; nocase; fast_pattern; http.request_body; content:"feed_url"; nocase; content:"://"; classtype:web-application-attack; reference:cve,CVE-2026-54339; reference:url,https://www.exploit.observer/?keyword=CVE-2026-54339&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=glean&match=exact; sid:1095204; rev:1;)