Werk #6516: Fixed stored XSS using alert handler config

Component	Alert handlers
Title	Fixed stored XSS using alert handler config
Date	Aug 30, 2018
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Pro, Checkmk Ultimate MT 1.5.0p3 Checkmk Pro, Checkmk Ultimate MT

A user with permission to the alert handler administration could use an alert rule to store arbitrary javascript code which would then be executed in the context of the browser of another user with permission to the alert handler administration when viewing the list of alert handlers.

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