Unregistered users can see "public" messages from a closed wiki via notifications from a different wiki

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.7 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

EPSS

• CVE-2025-32783: 0.32% estimated exploitation activity in the next 30 days; percentile 25.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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

Published by the source

16 Apr 2025, 15:33 UTC

Last modified by the source

17 Apr 2025, 12:39 UTC

Source last checked

26 Oct 2026, 16:35 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-42fh-pvvh-999x

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# Patch Next advisory brief: CVE-2025-32783

Advisory: Unregistered users can see "public" messages from a closed wiki via notifications from a different wiki
IDs: CVE-2025-32783, GHSA-42fh-pvvh-999x
Record: https://patchnext.com/advisories/cve-2025-32783 (revision 1, source checked 26 Oct 2026, 16:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.xwiki.platform:xwiki-platform-messagestream: affected >= 5.0, <= 16.7.1

## Suggested inspection (read-only)
- Maven org.xwiki.platform:xwiki-platform-messagestream: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.xwiki.platform:xwiki-platform-messagestream.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-42fh-pvvh-999x (GitHub-reviewed advisory GHSA-42fh-pvvh-999x lists affected ranges: Maven org.xwiki.platform:xwiki-platform-messagestream >=5.0 <=16.7.1)

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