Opened 9 years ago

Last modified 9 years ago

#23561 closed Uncategorized

Can unauthorized JS execution happen in quoted & escaped HTML class name? — at Version 1

Reported by: djbug Owned by: nobody
Component: Documentation Version: 1.7
Severity: Normal Keywords:
Cc: Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by djbug)

According to

<style class="{{ var }}">...</style>

If var is set to 'class1 onmouseover=javascript:func()', this can result in unauthorized JavaScript execution, depending on how the browser renders imperfect HTML.

If var is escaped and the class attribute is in quotes, how can JS execution happen?

The previous version of docs i.e. & before didn't have quotes around {{var}} and that made sense as you switch out of the attribute context with many characters. Is this a typo in the docs for 1.7 or is it implied that the invalid characters in class name *may* cause a security exception in some obscure browser that might close the class context. Is this a known security issue in any browser?

Change History (1)

comment:1 Changed 9 years ago by djbug

Description: modified (diff)
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