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CVE-2026-34151

XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+

CVSS 4.0 8.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-34151

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-34151

Published

xwiki-platform

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "xwiki",
                    "product": "xwiki-platform",
                    "versions": [
                        {
                            "version": "< 17.10.5",
                            "status": "affected"
                        },
                        {
                            "version": ">= 18.0.0-rc-1, < 18.2.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON