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Vulnerability · Published May 20, 2026 · Assigned by GitHub_M

CVE-2026-33137XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}

Critical 9.3

In plain English

A critical-severity missing authorization in xwiki-platform from xwiki. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.3Critical
Exploit odds (30 days)0.6%top 51.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.xwiki.platform:xwiki-platform-rest-server16.10.17GHSA-qrvh-r3f2-9h4r
Mavenorg.xwiki.platform:xwiki-platform-rest-server17.4.9GHSA-qrvh-r3f2-9h4r
Mavenorg.xwiki.platform:xwiki-platform-rest-server17.10.3GHSA-qrvh-r3f2-9h4r
Mavenorg.xwiki.platform:xwiki-platform-rest-server18.1.0-rc-1GHSA-qrvh-r3f2-9h4r

Affected products (as reported)

VendorProductVersions
xwiki xwiki-platform >= 15.10.6, < 16.10.17>= 17.0.0-rc-1, < 17.4.9>= 17.5.0, < 17.10.3>= 18.0.0-rc-1, < 18.1.0-rc-1

Weakness: CWE-862 · 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

References