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CVE-2026-33137 — Vulnerability in...

CRITICAL

XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}

Published May 26, 2026Updated May 26, 2026Source: osv

Summary

### 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.).

Advisory Timeline

  • First published May 26, 2026 (139 days ago).
  • Last revised May 26, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.xwiki.platform:xwiki-platform-rest-server to 18.1.0-rc-1 or later
<!-- Update pom.xml dependency version to 18.1.0-rc-1 for org.xwiki.platform:xwiki-platform-rest-server -->
Maven
Update org.xwiki.platform:xwiki-platform-rest-server to 16.10.17 or later
<!-- Update pom.xml dependency version to 16.10.17 for org.xwiki.platform:xwiki-platform-rest-server -->
Maven
Update org.xwiki.platform:xwiki-platform-rest-server to 17.10.3 or later
<!-- Update pom.xml dependency version to 17.10.3 for org.xwiki.platform:xwiki-platform-rest-server -->
Maven
Update org.xwiki.platform:xwiki-platform-rest-server to 17.4.9 or later
<!-- Update pom.xml dependency version to 17.4.9 for org.xwiki.platform:xwiki-platform-rest-server -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
org.xwiki.platform:xwiki-platform-rest-server
maven
All versions18.1.0-rc-1
org.xwiki.platform:xwiki-platform-rest-server
maven
All versions16.10.17
org.xwiki.platform:xwiki-platform-rest-server
maven
All versions17.10.3
org.xwiki.platform:xwiki-platform-rest-server
maven
All versions17.4.9

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-862
    Missing AuthorizationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

Frequently Asked Questions

What is CVE-2026-33137?
XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName} This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-33137?
CVE-2026-33137 affects org.xwiki.platform:xwiki-platform-rest-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33137 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-qrvh-r3f2-9h4r

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