alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2021-26829 OpenPLC ScadaBR - Cross-Site Scripting"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"index.php"; nocase; fast_pattern; content:"<script"; nocase; classtype:web-application-attack; reference:cve,CVE-2021-26829; reference:url,https://www.exploit.observer/?keyword=CVE-2021-26829&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=openplc&match=exact; sid:1004633; rev:2;)