XWiki Platform is a generic wiki platform. Prior to 17.10.5 and 18.2.0, the /skin/ action in com.xpn.xwiki.web.SkinAction can resolve double-encoded parent-directory segments outside the intended skin or web-application resource prefix when Jetty 12 or later decodes the request path. The affected lookup is replaced with Environment.getResourceAsStream(String, String), which constrains a resource to its expected prefix. An unauthenticated remote attacker can use the vulnerable behavior to read arbitrary resources permitted to the Jetty process, including WEB-INF/xwiki.cfg and, depending on deployment depth and operating-system permissions, host files. Tomcat and Jetty versions before 12 do not appear affected. This issue is fixed in versions 17.10.5 and 18.2.0.
History

Tue, 15 Sep 2026 06:15:00 +0000

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

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description XWiki Platform is a generic wiki platform. Prior to 17.10.5 and 18.2.0, the /skin/ action in com.xpn.xwiki.web.SkinAction can resolve double-encoded parent-directory segments outside the intended skin or web-application resource prefix when Jetty 12 or later decodes the request path. The affected lookup is replaced with Environment.getResourceAsStream(String, String), which constrains a resource to its expected prefix. An unauthenticated remote attacker can use the vulnerable behavior to read arbitrary resources permitted to the Jetty process, including WEB-INF/xwiki.cfg and, depending on deployment depth and operating-system permissions, host files. Tomcat and Jetty versions before 12 do not appear affected. This issue is fixed in versions 17.10.5 and 18.2.0.
Title XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+
Weaknesses CWE-24
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

ssvc

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


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-14T17:12:18.814Z

Updated: 2026-09-14T18:56:11.951Z

Reserved: 2026-03-25T20:12:04.196Z

Link: CVE-2026-34151

cve-icon Vulnrichment

Updated: 2026-09-14T18:56:07.351Z

cve-icon NVD

Status : Deferred

Published: 2026-09-14T18:17:47.107

Modified: 2026-09-30T19:57:08.043

Link: CVE-2026-34151

cve-icon Redhat

No data.