Item13601: Page cache pollution by illegal path components.

This happens frequently on Foswiki.org, ioe on Community.WebHome and now System.WebHome:

A link such as

<a href="%SCRIPTURLPATH{"view"}%/Main/WebHome&#;gt">Pollute my cache</a>

... will store the "Missing or illegal web name" warning screen into the page cache then accessible visiting the real topic.

This is probably not related to the page cache but to Foswiki::_parsePath() being called with a bad path and then returning a default value.

Solution for Foswiki::PageCache::isCacheable is to return false in case there is an invalidWeb or invalidTopic being found as part of the current $session.

-- MichaelDaum - 03 Aug 2015

I've patched Foswiki.org as this is most annoying.

-- MichaelDaum - 03 Aug 2015

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