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;)