ET WEB_SPECIFIC_APPS UniFi Network Application Unauthenticated Path Traversal (CVE-2026-22557)

Query · suricata

flow:established,to_server;
http.uri;
content:"/guest/s/default/login|3f|"; fast_pattern;
content:"page_error|3d|";
pcre:"/^[^\x26]*?(?:(?:\x2e|%+(?:25)?2[Ee]|%+(?:25)?32%+(?:25)?[46]5){1,2}(?:\x2f|\x5c|%+(?:25)?(?:25)?5[Cc]|%+(?:25)?2[Ff]){1,}){2,}/R";
http.referer;
content:"/guest/s/default";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS UniFi Network Application Unauthenticated Path Traversal (CVE-2026-22557) · 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 UniFi Network Application Unauthenticated Path Traversal (CVE-2026-22557)";
    flow:established,to_server;
    http.uri;
    content:"/guest/s/default/login|3f|"; fast_pattern;
    content:"page_error|3d|";
    pcre:"/^[^\x26]*?(?:(?:\x2e|%+(?:25)?2[Ee]|%+(?:25)?32%+(?:25)?[46]5){1,2}(?:\x2f|\x5c|%+(?:25)?(?:25)?5[Cc]|%+(?:25)?2[Ff]){1,}){2,}/R";
    http.referer;
    content:"/guest/s/default";
    reference:url,github.com/ThePotatoOfDoom/CVE-2026-22557-PoC;
    reference:cve,2026-22557;
    classtype:web-application-attack;
    sid:2070135; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_07_01, cve CVE_2026_22557, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_01, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.