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https://issues.apache.org/jira/browse/HBASE-17409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799212#comment-15799212
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Josh Elser commented on HBASE-17409:
------------------------------------

bq. Should underscore be allowed ?

It's up to us. We can add that in and I don't think it would have any 
implications.

It looks like the full list of valid of javascript function names is rather 
long/intense 
(http://stackoverflow.com/questions/1661197/what-characters-are-valid-for-javascript-variable-names).
 Choosing alphanumeric just makes things easier :). Happy to add the underscore 
if you think that's a good idea, Ted.

> Re-fix XSS request issue in JMXJsonServlet
> ------------------------------------------
>
>                 Key: HBASE-17409
>                 URL: https://issues.apache.org/jira/browse/HBASE-17409
>             Project: HBase
>          Issue Type: Sub-task
>          Components: security, UI
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 2.0.0, 1.4.0, 1.3.1
>
>         Attachments: HBASE-17409.001.patch
>
>
> I have a patch here which should mitigate the XSS issue in this servlet 
> without the use of owasp.



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