ET HUNTING Javascript Prototype Pollution Attempt via __proto__ in HTTP URI

Query · suricata

flow:established,to_server;
http.uri;
content:"__proto__";
pcre:"/[\x22\x27\x3a\x5b\x2e\x3f\x23\x26]__proto__(?:[\x2e\x3a\x5b\x5d]|\x5c?[\x22\x27]|\x25(?:2[eE]|3[aA]|5[bBdD]))/";
target:dest_ip;
Raw source ET HUNTING Javascript Prototype Pollution Attempt via __proto__ in HTTP URI · 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 HUNTING Javascript Prototype Pollution Attempt via __proto__ in HTTP URI";
    flow:established,to_server;
    http.uri;
    content:"__proto__";
    pcre:"/[\x22\x27\x3a\x5b\x2e\x3f\x23\x26]__proto__(?:[\x2e\x3a\x5b\x5d]|\x5c?[\x22\x27]|\x25(?:2[eE]|3[aA]|5[bBdD]))/";
    reference:url,portswigger.net/web-security/prototype-pollution;
    classtype:web-application-activity;
    sid:2066196; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2025_12_09, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_12_09;
    target:dest_ip;
)

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