Werk #12762: Fix XSS

Component User interface
Title Fix XSS
Date May 7, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p4 2.1.0i1 1.6.0p25
Level Trivial Change
Class Security Fix
Compatibility Compatible - no manual interaction needed

JavaScript was executed in the tag overview and notification rules if sripts were entered in the the title, topic and help text of aux tags and tags.

FEED-6031

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