Charset Manipulation Vulnerability

Anandhu Krishnan
Published on
14 May 2024


This vulnerability occurs when the application does not properly set its response character set, allowing an attacker to manipulate the HTML and potentially inject malicious code. A compromised charset declaration can be used to bypass server-side XSS protections and embed scripts in the page.


Ensure that all charset declarations are set to UTF-8. If user-input is required to decide a charset declaration, only allow a specific list of values.

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Written by
Anandhu Krishnan
Anandhu Krishnan
Lead Engineer
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