Answer in brief
CVE-2026-34151 records a High severity vulnerability in XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+. The current sources do not mark it as known exploited. The current feed maps xwiki/xwiki-platform (generic), org.xwiki.platform:xwiki-platform-oldcore (maven), org.xwiki.platform:xwiki-platform-oldcore (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps xwiki/xwiki-platform (generic), org.xwiki.platform:xwiki-platform-oldcore (maven), org.xwiki.platform:xwiki-platform-oldcore (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| xwiki/xwiki-platformgeneric | < 17.10.5 || >= 18.0.0-rc-1, < 18.2.0 | Not reported |
| org.xwiki.platform:xwiki-platform-oldcoremaven | <17.10.5 | 17.10.5 |
| org.xwiki.platform:xwiki-platform-oldcoremaven | >=18.0.0-rc-1,<18.2.0 | 18.2.0 |
Published upstream
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.