alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
msg:"ET WEB_SPECIFIC_APPS vBulletin Unauthenticated Remote Code Execution (CVE-2026-61511)";
flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"routestring|3d|"; fast_pattern;
pcre:"/^(?:\x2f|\x25(?:25)?2[fF])?ajax(?:\x2f|\x25(?:25)?2[fF])render(?:\x2f|\x25(?:25)?2[fF])pagenav/R";
content:"pagenav";
pcre:"/^(?:\x5b|\x25(?:25)?5[bB])pagenumber(?:\x5d|\x25(?:25)?5[dD])\x3d[^&]*?(\x28|\x25(?:25)?28){2,}/R";
reference:url,ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/;
reference:cve,2026-61511;
classtype:web-application-attack;
sid:2071327; rev:1;
metadata:affected_product vBulletin, attack_target Server, tls_state TLSDecrypt, created_at 2026_07_27, cve CVE_2026_61511, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
target:dest_ip;
)