ET WEB_SPECIFIC_APPS Flowise Pre-Auth Arbitrary File Upload Attempt (CVE-2025-26319)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Flowise Pre-Auth Arbitrary File Upload Attempt (CVE-2025-26319)";
    flow:established,to_server;
    http.request_line;
    content:"POST /api/v1/attachments/"; startswith; fast_pattern;
    pcre:"/^[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R";
    reference:url,medium.com/@attias.dor/the-burn-notice-part-2-5-5-flowise-pre-auth-arbitrary-file-upload-cve-2025-26319-0d4194a34183;
    reference:cve,2025-26319;
    classtype:attempted-admin;
    sid:2061358; rev:1;
    metadata:affected_product Flowise, attack_target Web_Server, tls_state plaintext, created_at 2025_04_07, cve CVE_2025_26319, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_07, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)