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https://issues.apache.org/jira/browse/WW-5180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17531117#comment-17531117
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Lukasz Lenart commented on WW-5180:
-----------------------------------
Just for future, if you discovered a security vulnerability it's better to use
our private list to report and keep the whole communication in private.
https://struts.apache.org/security.html
> SecurityMemberAccess.java have a security bug
> -----------------------------------------------
>
> Key: WW-5180
> URL: https://issues.apache.org/jira/browse/WW-5180
> Project: Struts 2
> Issue Type: Improvement
> Affects Versions: 2.5.x
> Reporter: tanli
> Priority: Blocker
>
> [https://github.com/apache/struts/pull/546]
> clazz.isAssignableFrom(excludedClass)
> need add
> excludedClass.isAssignableFrom(clazz)
>
> because
> A.isAssignableFrom(B) this judge if B belong A
>
> so in the future the attack exp will excluded by excludedClass, because exp's
> class is belong to one of excludedClass
>
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