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    Bypass __proto__ string match defense

    Chrome logo 1

    Some applications protect against prototype pollution by matching the string "__proto__". We can bypass that.

    Created by: vitorfhc

    Created on: Thursday, August 29, 2024 at 1:03:13 AM

    Updated on: Tuesday, May 20, 2025 at 11:50:48 AM

    Vector type: JS

    Vector charset: UTF-8

    Template used:
    s = "$[i]";
if (typeof s["$[chr]__proto__"] != "undefined") {
    log(fromCodePoint($[i]));
}
    Your browser was detected as:
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    Sample payloads

    s = "0";
if (typeof s["__proto__"] != "undefined") {
    alert(fromCodePoint(0));
}

    Fuzz results

    Chrome logo
    Chrome 128.0.0.0 desktop macOS 10.15.7

    Updated

    Thu Aug 29 2024
    Found 1 result
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