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bdu:2026-07302

EUVD-2026-321505

fkie_cve-2026-33137

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki Platform is a generic wiki platform. In versions starting with 15.10.6 and prior to 18.1.0-rc-1, 17.10.3, 17.4.9, and 16.10.17, the POST /wikis/{wikiName} API executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki. This vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1.

GHSA-qrvh-r3f2-9h4r — XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}

Affected: Maven: org.xwiki.platform:xwiki-platform-rest-server

### Impact

`POST /wikis/{wikiName}` executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki

### Patches

This vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1.

### Workarounds

XWiki is not aware of any workarounds other than adding a rule into an HTTP proxy to prevent access POST request in the `/wikis/{wikiName}[/]` endpoint.

### Resources

* https://jira.xwiki.org/browse/XWIKI-23953 * https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f

### For more information

If there are any questions or comments about this advisory: * Open an issue in [Jira XWiki.org](https://jira.xwiki.org/) * Send an email to the [Security Mailing List](mailto:security@xwiki.org)

### Attribution

Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).

WID-SEC-W-2026-1594 — xwiki: Schwachstelle ermöglicht Manipulation von Daten

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in xwiki ausnutzen, um Daten zu manipulieren.