CVE-2026-34151
XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+
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.
INFO
Published Date :
Sept. 14, 2026, 5:12 p.m.
Last Modified :
Sept. 14, 2026, 5:12 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-34151
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update XWiki Platform to version 17.10.5 or later.
- Update XWiki Platform to version 18.2.0 or later.
- Ensure Jetty version is below 12 or update it.
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CVE-2026-34151 vulnerability anywhere in the article.