alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS ServiceNow BodySnatcher Virtual Agent API Authentication Bypass (CVE-2025-12420)"; flow:established,to_server; http.uri; content:"/api/sn_va_as_service/"; fast_pattern; http.header; content:"|0d 0a|token|3a 20|"; nocase; content:"x-usertoken|3a 20|"; nocase; http.request_body; content:"|22|appInboundId|22 3a 20 22|default-external-agent|22|"; http.method; content:"POST"; reference:url,appomni.com/ao-labs/bodysnatcher-agentic-ai-security-vulnerability-in-servicenow/; reference:cve,2025-12420; classtype:web-application-attack; sid:2067121; rev:1; metadata:affected_product ServiceNow, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_27, cve CVE_2025_12420, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)