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.
Metrics
Affected Vendors & Products
References
History
Tue, 15 Sep 2026 06:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Xwiki
Xwiki xwiki-platform |
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| Vendors & Products |
Xwiki
Xwiki xwiki-platform |
Mon, 14 Sep 2026 21:00:00 +0000
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| 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 |
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| Metrics |
cvssV4_0
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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
Updated: 2026-09-14T18:56:07.351Z
Status : Deferred
Published: 2026-09-14T18:17:47.107
Modified: 2026-09-30T19:57:08.043
Link: CVE-2026-34151
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