bleach.clean behavior parsing noscript tags did not match
browser behavior.
Calls to bleach.clean allowing noscript and one or more of
the raw text tags (title, textarea, script, style,
noembed, noframes, iframe, and xmp) were vulnerable
to a mutation XSS.
This security issue was confirmed in Bleach versions v2.1.4, v3.0.2,
and v3.1.0. Earlier versions are probably affected too.
Anyone using Bleach <=v3.1.0 is highly encouraged to upgrade.
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