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https://issues.apache.org/jira/browse/TAP5-1004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914685#action_12914685
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Howard M. Lewis Ship commented on TAP5-1004:
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I'm not sure this occurs, at least not with Jetty (I haven't tried with
Tomcat). I'm seeing the whitespace in the message reduced.
> X-Tapestry-ErrorMessage may lead to HTTP Response Splitting
> -----------------------------------------------------------
>
> Key: TAP5-1004
> URL: https://issues.apache.org/jira/browse/TAP5-1004
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.5
> Reporter: Paul Rehrl
> Assignee: Howard M. Lewis Ship
>
> The DefaultRequestExceptionHandler sets the X-Tapestry-ErrorMessage header
> but fails to sanitize or encode the error message. This enables an attacker
> to inject malicious HTTP headers or to provide a 2nd HTTP response.
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