CVE-2026-33137

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

State: Published
Severity: 9.3 Critical
Published: May 20, 2026
Updated: May 26, 2026
Reserved: Mar 17, 2026

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 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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
xwiki-platformxwiki	>= 15.10.6, < 16.10.17Affected >= 17.0.0-rc-1, < 17.4.9Affected >= 17.5.0, < 17.10.3Affected >= 18.0.0-rc-1, < 18.1.0-rc-1Affected

References

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