Security update 1970-01-01

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Information disclosure in the back end

More info at https://contao.org/en/security-advisories/information-disclosure-in-the-back-end.html...

Cross site scripting via HTML attributes in the back end

More info at https://contao.org/en/security-advisories/cross-site-scripting-via-html-attributes-in-the-back-end.html...