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https://issues.apache.org/jira/browse/JSPWIKI-442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harry Metske resolved JSPWIKI-442.
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    Fix Version/s: 3.0
                   2.8.3
       Resolution: Fixed

Fixed in 2.8.4-svn-12 and 3.0.0-svn-218

> Prefixing the username with a space you can create usernames which look like 
> IP addresses.
> ------------------------------------------------------------------------------------------
>
>                 Key: JSPWIKI-442
>                 URL: https://issues.apache.org/jira/browse/JSPWIKI-442
>             Project: JSPWiki
>          Issue Type: Bug
>          Components: Authentication&Authorization
>    Affects Versions: 2.8, 2.8.1
>            Reporter: Janne Jalkanen
>            Priority: Minor
>             Fix For: 3.0, 2.8.3
>
>
> To reproduce: Just prepend the username with a space, and you can e.g. create 
> usernames like " 127.0.0.1", which can appear to be confusing.
> Suggestion: validate the username via a properly designed regexp.

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