CVE-2026-33137: XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}
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.
Published May 26, 2026
Affected packages
org.xwiki.platform:xwiki-platform-rest-server
- Ecosystem
- Maven
- Affected
- >= 15.10.6, < 16.10.17
- Fixed in
- 16.10.17
- Check
mvn dependency:tree -Dincludes=org.xwiki.platform:xwiki-platform-rest-server
org.xwiki.platform:xwiki-platform-rest-server
- Ecosystem
- Maven
- Affected
- >= 17.0.0-rc-1, < 17.4.9
- Fixed in
- 17.4.9
- Check
mvn dependency:tree -Dincludes=org.xwiki.platform:xwiki-platform-rest-server
org.xwiki.platform:xwiki-platform-rest-server
- Ecosystem
- Maven
- Affected
- >= 17.5.0, < 17.10.3
- Fixed in
- 17.10.3
- Check
mvn dependency:tree -Dincludes=org.xwiki.platform:xwiki-platform-rest-server
org.xwiki.platform:xwiki-platform-rest-server
- Ecosystem
- Maven
- Affected
- >= 18.0.0-rc-1, < 18.1.0-rc-1
- Fixed in
- 18.1.0-rc-1
- Check
mvn dependency:tree -Dincludes=org.xwiki.platform:xwiki-platform-rest-server
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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
- Send an email to the [Security Mailing List](mailto:[email protected])
Attribution
Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).
Credited to odgrso.
References
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qrvh-r3f2-9h4r
- https://nvd.nist.gov/vuln/detail/CVE-2026-33137
- https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f
- https://jira.xwiki.org/browse/XWIKI-23953
- https://github.com/advisories/GHSA-qrvh-r3f2-9h4r
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology