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Characters that can be between < and script>

Chrome logo 1
Firefox logo 1
Edge logo 1

Many blacklists do not allow < to be followed by a letter

m10x
Created bym10x
Created Nov 12, 2024
Updated May 27, 2025

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CategoryHTML Parsing
VisibilityPublic
TypeHTML
CharsetUTF-8
Template used:
<$[chr]script><notfound></script>

Sample payloads

<<script><notfound></script>

Fuzz results

Chrome logo
Chrome 145.0.0.0 desktop Windows NT 10.0
Updated17 Feb 2026
Found 1 result
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Chrome logo
Chrome 144.0.0.0 desktop macOS 10.15.7older version
Updated17 Feb 2026
Found 1 result
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Firefox logo
Firefox 148.0 desktop Windows NT 10.0
Updated23 Feb 2026
Found 1 result
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Firefox logo
Firefox 147.0 desktop Linuxolder version
Updated1 Feb 2026
Found 1 result
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Firefox logo
Firefox 144.0 desktop macOS 10.15older version
Updated23 Oct 2025
Found 1 result
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Firefox logo
Firefox 132.0 mobile Android 15older version
Updated12 Nov 2024
Found 1 result
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Edge logo
Microsoft Edge 145.0.0.0 desktop Windows NT 10.0
Updated18 Feb 2026
Found 1 result
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