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Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter
Moderate severity
GitHub Reviewed
Published
Jan 10, 2024
in
pallets/jinja
•
Updated Jan 27, 2024
The xmlattr filter in affected versions of Jinja accepts keys containing spaces. XML/HTML attributes cannot contain spaces, as each would then be interpreted as a separate attribute. If an application accepts keys (as opposed to only values) as user input, and renders these in pages that other users see as well, an attacker could use this to inject other attributes and perform XSS. Note that accepting keys as user input is not common or a particularly intended use case of the xmlattr filter, and an application doing so should already be verifying what keys are provided regardless of this fix.
CalumHutton Reporter
The
xmlattrfilter in affected versions of Jinja accepts keys containing spaces. XML/HTML attributes cannot contain spaces, as each would then be interpreted as a separate attribute. If an application accepts keys (as opposed to only values) as user input, and renders these in pages that other users see as well, an attacker could use this to inject other attributes and perform XSS. Note that accepting keys as user input is not common or a particularly intended use case of thexmlattrfilter, and an application doing so should already be verifying what keys are provided regardless of this fix.References