CVE-2026-33137 PUBLISHED

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

Assigner: GitHub_M
Reserved: 17.03.2026 Published: 20.05.2026 Updated: 21.05.2026

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.

Metrics

CVSS 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
CVSS Score: 9.3

Product Status

Vendor xwiki
Product xwiki-platform
Versions
  • Version < 16.10.17 is affected
  • Version >= 17.0.0-rc-1, < 17.4.9 is affected
  • Version >= 17.5.0, < 17.10.3 is affected
  • Version >= 18.0.0-rc-1, < 18.1.0-rc-1 is affected

References

Problem Types

  • CWE-862: Missing Authorization CWE