XWiki allows unregistered users to see "public" messages from a closed wiki via notifications from a different wiki

published 2025-04-16 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-11354 , GHSA-42fh-pvvh-999x

cvss: 4.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-17)

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

jira.xwiki.org https://jira.xwiki.org/browse/XWIKI-17154 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.7	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
GitHub	3.1	4.7	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.xwiki.platform:xwiki-platform-messagestream	>=5.0, <=16.7.1	no fix listed

Affected products

xwiki xwiki-platform

Classification

Weakness

CWE-668 Exposure of Resource to Wrong Sphere

References

jira.xwiki.org /browse/XWIKI-17154
exploit, web, issue-tracking, vendor-advisory
github.com /xwiki/xwiki-platform/security/advisories/GHSA-42fh-pvvh-999x
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2025-32783
advisory
github.com /xwiki/xwiki-platform
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary