CVE-2026-34151 json
XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+
published 4mo ago modified last mo. also EUVD-2026-77676 , GHSA-qj4x-9g63-25g6
- 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
- org.xwiki.platform xwiki-platform-oldcore 17.10.5, 18.2.0
- xwiki xwiki 17.10.5, 18.2.0
Is CVE-2026-34151 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
2.47% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).
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 Intel 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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.