alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-5728 LoLLMs - Chat Image Upload Content-Type Spoofing"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/upload/chat_image"; nocase; fast_pattern; http.request_body; content:"filename="; nocase; pcre:"/filename=\x22[^\x22]+\x2e(py|php|phtml|phar|js|html|sh|exe|svg)\x22/i"; content:"image/"; nocase; classtype:web-application-attack; reference:cve,CVE-2026-5728; reference:url,https://www.exploit.observer/?keyword=CVE-2026-5728&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=lollms&match=exact; sid:1093003; rev:1;)