ET WEB_SPECIFIC_APPS nginx-ui MCP Module Authentication Bypass (CVE-2026-33032)

Query · suricata

flow:established,to_server;
http.uri;
content:"/mcp_message|3f|"; fast_pattern;
content:"sessionid|3d|"; nocase;
http.header_names;
content:!"cookie|0d 0a|"; nocase;
http.method;
content:"POST";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS nginx-ui MCP Module Authentication Bypass (CVE-2026-33032) · 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 any (
    msg:"ET WEB_SPECIFIC_APPS nginx-ui MCP Module Authentication Bypass (CVE-2026-33032)";
    flow:established,to_server;
    http.uri;
    content:"/mcp_message|3f|"; fast_pattern;
    content:"sessionid|3d|"; nocase;
    http.header_names;
    content:!"cookie|0d 0a|"; nocase;
    http.method;
    content:"POST";
    reference:url,pluto.security/blog/mcp-bug-nginx-security-vulnerability-cvss-9-8/;
    reference:cve,2026-33032;
    classtype:web-application-attack;
    sid:2068850; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_04_21, cve CVE_2026_33032, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_04_21, 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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