alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-113683 Moodle VPL - Cross-Site Scripting Attempt"; flow:established,to_server; http.uri; content:"/mod/vpl/similarity/diff.php"; nocase; fast_pattern; content:"filename1="; nocase; content:"<"; distance:0; classtype:web-application-attack; reference:cve,CVE-2026-113683; reference:url,https://www.exploit.observer/?keyword=CVE-2026-113683&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=moodle&match=exact; sid:1078603; rev:1;)