ET WEB_SPECIFIC_APPS Ubiquiti Unifi OS Authentication Bypass (CVE-2026-34908)

Query · suricata

flow:established,to_server;
http.uri;
content:"/api/auth/validate-sso/"; startswith;
pcre:"/^[^\x3f\s]*(?:\x2e|\x25(?:25)?e[eE])\x25(?:25)?2[fF][^\x3f]*\x2f/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Ubiquiti Unifi OS Authentication Bypass (CVE-2026-34908) · 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_SPECIFIC_APPS Ubiquiti Unifi OS Authentication Bypass (CVE-2026-34908)";
    flow:established,to_server;
    http.uri;
    content:"/api/auth/validate-sso/"; startswith;
    pcre:"/^[^\x3f\s]*(?:\x2e|\x25(?:25)?e[eE])\x25(?:25)?2[fF][^\x3f]*\x2f/R";
    reference:url,www.boredhackerblog.info/2026/06/how-unifi-os-exploitation-may-have.html;
    reference:url,bishopfox.com/blog/popping-root-on-unifi-os-server-unauthenticated-rce-chain-detection-analysis;
    reference:cve,2026-34908;
    classtype:web-application-attack;
    sid:2069920; rev:1;
    metadata:affected_product Ubiquiti, attack_target Server, tls_state TLSDecrypt, created_at 2026_06_12, cve CVE_2026_34908, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_06_12, 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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