CVE-2025-32783: XWiki allows unregistered users to see "public" messages from a closed wiki via notifications from a different wiki
Impact
This vulnerability impacts users of a subwiki of XWiki where Message Stream is enabled and use, if they configured their wiki to be closed by selecting "Prevent unregistered users to view pages" in the Administrations Rights.
The vulnerability is that any message sent in a subwiki to "everyone" is actually sent to the farm: any visitor of the main wiki will be able to see that message through the Dashboard, even if the subwiki is configured to be private.
Patches
This problem has not been patched and is not going to be patched in the future: Message Stream has been deprecated in XWiki 16.8.0RC1 and is not maintained anymore.
Workarounds
Message Stream is disabled by default, it's advised to keep it disabled from Administration > Social > Message Stream.
References
https://jira.xwiki.org/browse/XWIKI-17154
Other sources
XWiki Platform is a generic wiki platform. A vulnerability in versions from 5.0 to 16.7.1 affects users with Message Stream enabled and a wiki configured as closed from selecting "Prevent unregistered users to view pages" in the Administrations Rights. The vulnerability is that any message sent in a subwiki to "everyone" is actually sent to the farm: any visitor of the main wiki will be able to see that message through the Dashboard, even if the subwiki is configured to be private. This issue will not be patched as Message Stream has been deprecated in XWiki 16.8.0RC1 and is not maintained anymore. A workaround for this issue involves keeping Message Stream disabled by default. It's advised to keep it disabled from Administration > Social > Message Stream.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-32783?
CVE-2025-32783 is considered a medium severity vulnerability that can expose sensitive information in a closed XWiki subwiki.
How do I fix CVE-2025-32783?
To fix CVE-2025-32783, update to a version of org.xwiki.platform:xwiki-platform-messagestream greater than 16.7.1.
Who is affected by CVE-2025-32783?
CVE-2025-32783 affects users of XWiki subwikis that have the Message Stream enabled and have restricted access settings.
What can happen if CVE-2025-32783 is exploited?
Exploitation of CVE-2025-32783 can allow unregistered users to access messages in a subwiki, compromising the privacy of that information.
Is CVE-2025-32783 related to any specific software version?
Yes, CVE-2025-32783 affects the org.xwiki.platform:xwiki-platform-messagestream versions from 5.0 to 16.7.1.