CVE-2026-33137
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk45th percentile - higher than 45% of all known CVEs
Summary
A vulnerability in XWiki Platform 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 performs a XAR import without authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki.
Risk Assessment
An unauthenticated attacker can modify wiki content, potentially leading to data integrity compromise and further attacks.
Recommendation
It is recommended to upgrade XWiki to versions 16.10.17, 17.4.9, 17.10.3, 18.0.1, or 18.1.0-rc-1, which fix this vulnerability.
Original NVD description (English source)
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.