jQuery is vulnerable to "prototype pollution" in versions used by OTRS Community Edition prior to 6.0.26. For details see here: https://snyk.io/test/npm/jquery/3.2.1
Upgrade to the latest available OTRS patch level (https://ftp.otrs.org/pub/otrs/).
ATTENTION: Please check if you have any OTRS add-ons installed. In this case, these might contain customized OTRS framework files which need to be updated first. Please contact us instead.
There is no workaround. Please follow the instructions under "Solution" above.