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 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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00039.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
xwiki xwiki-platform affected
Version Status Constraints
< 16.10.17 affected —
>= 17.0.0-rc-1, < 17.4.9 affected —
>= 17.5.0, < 17.10.3 affected —
>= 18.0.0-rc-1, < 18.1.0-rc-1 affected —

No data.

No data.

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Vendors Products
Xwiki Subscribe
Wiki-platform Subscribe

Project Subscriptions

Vendors Products
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Wiki-platform Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f cve-icon cve-icon
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qrvh-r3f2-9h4r cve-icon cve-icon
https://jira.xwiki.org/browse/XWIKI-23953 cve-icon cve-icon
History

Thu, 21 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 21 May 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Xwiki
Xwiki wiki-platform
Vendors & Products Xwiki
Xwiki wiki-platform

Wed, 20 May 2026 19:30:00 +0000

Type Values Removed Values Added
Description 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 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.
Title XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-21T13:26:33.928Z

Reserved: 2026-03-17T20:35:49.929Z

Link: CVE-2026-33137

cve-icon Vulnrichment

Updated: 2026-05-21T13:25:29.397Z

cve-icon NVD

Status : Deferred

Published: 2026-05-20T20:16:37.567

Modified: 2026-05-21T16:04:53.813

Link: CVE-2026-33137

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-21T08:00:05Z

Weaknesses