1be50ed28bFastSanitize checks the scheme with URI.parse/1, which finds none in java<TAB>script:alert(1). Browsers remove tabs and newlines and leading control characters first and run it as a javascript: link. The scrubbers now use Pleroma.HTML.URIAttributes, which normalizes the URL the same way before the scheme check.
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Scrubbers: remove links and images whose scheme is hidden with tabs, newlines or leading control characters (for example java<TAB>script:), which browsers still run as javascript:. Custom scrubbers should use Pleroma.HTML.URIAttributes.allow_tag_with_uri_attributes instead of the FastSanitize macro |