ET WEB_SERVER Cisco Catalyst SD-WAN Manager API Authentication Bypass (CVE-2026-76504)

Query · suricata

flow:established,to_server;
http.uri;
content:"/";
pcre:"/^(?!j_security_check)(?:j|%(?:25)?6[aA])(?:_|%(?:25)?5[fF])(?:s|%(?:25)?73)(?:e|%(?:25)?65)(?:c|%(?:25)?63)(?:u|%(?:25)?75)(?:r|%(?:25)?72)(?:i|%(?:25)?69)(?:t|%(?:25)?74)(?:y|%(?:25)?79)(?:_|%(?:25)?5[fF])(?:c|%(?:25)?63)(?:h|%(?:25)?68)(?:e|%(?:25)?65)(?:c|%(?:25)?63)(?:k|%(?:25)?6[bB])/R";
http.request_body;
content:"j_username|3d|viptela-reserved-"; fast_pattern;
pcre:"/^(?:cloudops|uc)(?:\x26|$)/R";
content:"j_password|3d|";
target:dest_ip;
Raw source ET WEB_SERVER Cisco Catalyst SD-WAN Manager API Authentication Bypass (CVE-2026-76504) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SERVER Cisco Catalyst SD-WAN Manager API Authentication Bypass (CVE-2026-76504)";
    flow:established,to_server;
    http.uri;
    content:"/";
    pcre:"/^(?!j_security_check)(?:j|%(?:25)?6[aA])(?:_|%(?:25)?5[fF])(?:s|%(?:25)?73)(?:e|%(?:25)?65)(?:c|%(?:25)?63)(?:u|%(?:25)?75)(?:r|%(?:25)?72)(?:i|%(?:25)?69)(?:t|%(?:25)?74)(?:y|%(?:25)?79)(?:_|%(?:25)?5[fF])(?:c|%(?:25)?63)(?:h|%(?:25)?68)(?:e|%(?:25)?65)(?:c|%(?:25)?63)(?:k|%(?:25)?6[bB])/R";
    http.request_body;
    content:"j_username|3d|viptela-reserved-"; fast_pattern;
    pcre:"/^(?:cloudops|uc)(?:\x26|$)/R";
    content:"j_password|3d|";
    reference:url,www.vulncheck.com/blog/revenge-of-the-sd-wan-cve-2026-76504;
    reference:cve,2026-76504;
    classtype:attempted-user;
    sid:2072391; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_10_08, cve CVE_2026_76504, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2026_10_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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