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https://issues.apache.org/jira/browse/OAK-10334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739102#comment-17739102
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Marcel Reutegger commented on OAK-10334:
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Created draft PR with a test reproducing the issue:
https://github.com/apache/jackrabbit-oak/pull/1011
> Node.addMixin() may overwrite existing mixins
> ---------------------------------------------
>
> Key: OAK-10334
> URL: https://issues.apache.org/jira/browse/OAK-10334
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: jcr
> Reporter: Marcel Reutegger
> Priority: Major
>
> A Session lacking permission to read property jcr:mixinTypes, but permission
> to write will overwrite existing mixins when calling Node.addMixin().
> The implementation does not check if the session has permission to read
> jcr:mixinTypes and assumes there are no existing values when the session does
> not have permission. The result is a jcr:mixinTypes property with only a
> single value passed to addMixin().
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