Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M
CVE-2026-34151XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+
High 8.2
In plain English
A high-severity security flaw in xwiki-platform from xwiki. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.xwiki.platform:xwiki-platform-oldcore | 17.10.5 | GHSA-qj4x-9g63-25g6 |
| Maven | org.xwiki.platform:xwiki-platform-oldcore | 18.2.0 | GHSA-qj4x-9g63-25g6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| xwiki | xwiki-platform | < 17.10.5>= 18.0.0-rc-1, < 18.2.0 |
Weakness: CWE-24 · 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
References
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qj4x-9g63-25g6 x_refsource_CONFIRM
- https://github.com/xwiki/xwiki-commons/pull/1675 x_refsource_MISC
- https://github.com/xwiki/xwiki-platform/commit/79eba8655f3a96021a8e7ad07956e48d20a82383 x_refsource_MISC
- https://github.com/xwiki/xwiki-platform/commit/f7b33704083d3b4e45d1b9fc1e2cc33c66855f85 x_refsource_MISC
- https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-17.10.5 x_refsource_MISC
- https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-18.2.0 x_refsource_MISC
- https://jira.xwiki.org/browse/XCOMMONS-3594 x_refsource_MISC
- https://jira.xwiki.org/browse/XWIKI-24075 x_refsource_MISC