alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 406 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 406 Not Acceptable|0d 0a|"; depth:29; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; sid:2010522; rev:6; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, deprecation_reason Performance, performance_impact Significant, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2024_04_10;)