CVE-2026-34151 json
XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+
published 2026-07-07 4 mo ago modified 2026-09-30 39 d ago also GHSA-qj4x-9g63-25g6 , EUVD-2026-77676
- cvss
- 8.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.5%
- EPSS 2.5% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- maven org.xwiki.platform:xwiki-platform-oldcore 17.10.5, 18.2.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 55 d ago
Exploit prediction
2.47% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template XWiki Platform - Path Traversal nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.2 | 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 |
| CNA | 4.0 | 8.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.xwiki.platform:xwiki-platform-oldcore | <17.10.5 >=18.0.0-rc-1, <18.2.0 |
17.10.5 18.2.0 |
Affected products
- xwiki xwiki-platform
Classification
- Weakness
-
- CWE-24 Path Traversal: '../filedir'
References
-
github.com
/xwiki/xwiki-commons/pull/1675
web
- github.com /xwiki/xwiki-platform/commit/79eba8655f3a96021a8e7ad07956e48d20a82383
- github.com /xwiki/xwiki-platform/commit/f7b33704083d3b4e45d1b9fc1e2cc33c66855f85
-
github.com
/xwiki/xwiki-platform/security/advisories/GHSA-qj4x-9g63-25g6
web
- github.com /xwiki/xwiki-platform/releases/tag/xwiki-platform-17.10.5
- github.com /xwiki/xwiki-platform/releases/tag/xwiki-platform-18.2.0
-
jira.xwiki.org
/browse/XCOMMONS-3594
web
-
jira.xwiki.org
/browse/XWIKI-24075
web
-
github.com
/xwiki/xwiki-platform
package
Sources
- CVE List CVE-2026-34151
- GitHub Advisory GHSA-qj4x-9g63-25g6
- NVD CVE-2026-34151
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.