Characters that expand upon toUpperCase()

Useful to bypass strict length checks and differentials between toUpperCase() / toLowerCase() .

Created by: DreyAnd

Created on: Wednesday, April 10, 2024 at 10:34:26 PM

Updated on: Tuesday, September 24, 2024 at 7:19:39 AM

Vector type: JS

Code used before fuzz:

function isASCII(str) {
  for (var i = 0; i < str.length; i++) {
    if (str.charCodeAt(i) > 127) {
      return false;
    }
  }
  return true;
}

Template used:

const c = String.fromCodePoint(i)
const c_upper = c.toUpperCase()
if (c_upper.length > c.length && isASCII(c_upper)){
    log(c)
}

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Sample payloads

const c = String.fromCodePoint(i)
const c_upper = c.toUpperCase()
if (c_upper.length > c.length && isASCII(c_upper)){
    alert(c)
}

Chrome 124.0.0.0 Unknown Unknown

Updated

Fri Apr 19 2024

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