ET WEB_SPECIFIC_APPS Qwik Unauthenticated RCE via server$ Deserialization (CVE-2026-27971)

Query · suricata

flow:established,to_server;
http.uri;
content:"qfunc|3d|sync"; fast_pattern;
http.header;
content:"x-qrl|3a 20|"; nocase;
http.request_body;
content:"|22|_objs|22 3a|";
http.method;
content:"POST";
Raw source ET WEB_SPECIFIC_APPS Qwik Unauthenticated RCE via server$ Deserialization (CVE-2026-27971) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Qwik Unauthenticated RCE via server$ Deserialization (CVE-2026-27971)";
    flow:established,to_server;
    http.uri;
    content:"qfunc|3d|sync"; fast_pattern;
    http.header;
    content:"x-qrl|3a 20|"; nocase;
    http.request_body;
    content:"|22|_objs|22 3a|";
    http.method;
    content:"POST";
    reference:url,vulnerabletarget.com/detail.html?id=vt-2026-27971;
    reference:cve,2026-27971;
    classtype:web-application-attack;
    sid:2068291; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_03_17, cve CVE_2026_27971, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_03_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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