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https://issues.apache.org/jira/browse/SOLR-8307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011180#comment-15011180
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Erik Hatcher commented on SOLR-8307:
------------------------------------

[~thetaphi] looks like the diff feature of the admin UI sends XML (it got from 
Solr) to SolrInfoMBeanHandler with diff=true.  And then that XML is parsed by 
XMLResponseParser.  Looks like a legit vector.

> XXE Vulnerability
> -----------------
>
>                 Key: SOLR-8307
>                 URL: https://issues.apache.org/jira/browse/SOLR-8307
>             Project: Solr
>          Issue Type: Bug
>          Components: UI
>    Affects Versions: 5.3
>            Reporter: Adam Johnson
>         Attachments: SOLR-8307.patch
>
>
> Use the drop-down in the left menu to select a core. Use the “Watch Changes” 
> feature under the “Plugins / Stats” option. When submitting the changes, XML 
> is passed in the “stream.body” parameter and is vulnerable to XXE.



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