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Test your applicationsUpgrade org.xwiki.platform:xwiki-platform-rest-server
to version 15.10.14, 16.4.6, 16.10.0-rc-1 or higher.
Affected versions of this package are vulnerable to Transmission of Private Resources into a New Sphere ('Resource Leak') through the REST endpoint. An attacker can access private page information by sending unauthorized requests to the /rest/wikis/[wikiName]/pages
endpoint.
Note:
This is particularly exploitable if the entire wiki is protected with "Prevent unregistered user to view pages" as the endpoint still lists the pages of the wiki.