{"id":"CVE-2026-34151","aliases":["EUVD-2026-77676","GHSA-qj4x-9g63-25g6"],"status":"published","title":"XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+","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.","severity":{"version":"4.0","score":8.2,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.02469,"percentile":0.84619,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-24"],"published":"2026-07-07T13:01:21Z","modified":"2026-10-28T11:12:05Z","exploits":[{"source":"nuclei","id":"CVE-2026-34151","title":"XWiki Platform - Path Traversal","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34151.yaml"}],"fixes":[{"ecosystem":"Maven","package":"org.xwiki.platform:xwiki-platform-oldcore","fixed_in":["17.10.5","18.2.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.xwiki.platform:xwiki-platform-oldcore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17.10.5"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.xwiki.platform:xwiki-platform-oldcore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"18.0.0-rc-1"},{"fixed":"18.2.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.xwiki.platform:xwiki-platform-oldcore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17.10.5"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.xwiki.platform:xwiki-platform-oldcore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"18.0.0-rc-1"},{"fixed":"18.2.0"}]}]}],"products":[{"vendor":"xwiki","product":"xwiki-platform"}],"references":[{"url":"https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qj4x-9g63-25g6","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/xwiki/xwiki-commons/pull/1675","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/xwiki/xwiki-platform/commit/79eba8655f3a96021a8e7ad07956e48d20a82383","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/xwiki/xwiki-platform/commit/f7b33704083d3b4e45d1b9fc1e2cc33c66855f85","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-17.10.5","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-18.2.0","tags":["x_refsource_MISC","web"]},{"url":"https://jira.xwiki.org/browse/XCOMMONS-3594","tags":["x_refsource_MISC","web"]},{"url":"https://jira.xwiki.org/browse/XWIKI-24075","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-qj4x-9g63-25g6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34151.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34151","tags":["advisory"]},{"url":"https://github.com/xwiki/xwiki-platform","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-34151","title":"XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+","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.","status":"published","published":"2026-09-14T17:12:18.814Z","modified":"2026-09-14T18:56:11.951Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high","assessor":"cna"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T14:20:14.665567Z"}],"euvd":[{"id":"EUVD-2026-77676","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.","status":"published","published":"2026-09-14T17:12:18Z","modified":"2026-09-14T18:56:11Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high"}],"updated_at":"2026-11-02T17:28:19.730872Z"}],"ghsa":[{"id":"GHSA-qj4x-9g63-25g6","title":"XWiki Platform Old Core: Resource path traversal via /skin/ action endpoint in Jetty 12+","description":"### Impact\n\nWith Jetty 12+ a user can craft a URL to access any resource the Jetty instance is allowed to access.\n\nFor example `http://[host]/xwiki/bin/skin/..%252f/..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc/passwd` allows downloading the content of the /etc/passwd file, provided Jetty is allowed to read it, and if your XWiki webapp is located exactly 5 levels below `/` (like `/var/lib/jetty/webapps/xwiki`, which is the case in the docker image, for example).\n\nAnother example which does not go out of the XWiki webapp, but it's still a vulnerability (since users should not be allowed to access Hibernate or XWiki configuration files) is `http://[host]/xwiki/bin/skin/..%252f/..%252fWEB-INF/xwiki.cfg`.\n\n### Patches\n\nThis vulnerability has been patched in XWiki 17.10.5 and 18.2.0.\n\n### Workarounds\n\nA possible workaround is to use a different application server, like Jetty \u003c 12 (in the case of XWiki \u003c 17) or Tomcat, which don't seem to be impacted.\n\n### Resources\n\n* https://jira.xwiki.org/browse/XWIKI-24075\n* https://jira.xwiki.org/browse/XCOMMONS-3594\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n* Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)\n* Send an email to the [Security Mailing List](mailto:security@xwiki.org)\n\n### Attribution\n\n Lê Ngọc Khoa reported the vulnerability.","status":"published","published":"2026-07-07T13:01:21Z","modified":"2026-07-07T13:01:23Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T14:40:40.389795Z"}],"nvd":[{"id":"CVE-2026-34151","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.","status":"published","published":"2026-09-14T18:17:47.107Z","modified":"2026-09-30T19:57:08.043Z","cvss":[{"version":"4.0","score":8.2,"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/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","level":"high","assessor":"secondary"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T14:12:46.980627Z"}],"osv":[{"id":"CVE-2026-34151","title":"XWiki Platform: Resource path traversal via /skin/ action endpoint in Jetty 12+","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.","status":"published","published":"2026-09-14T17:12:18.814Z","modified":"2026-10-28T11:12:05.736781466Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T15:45:02.247031Z"},{"id":"GHSA-qj4x-9g63-25g6","title":"XWiki Platform Old Core: Resource path traversal via /skin/ action endpoint in Jetty 12+","description":"### Impact\n\nWith Jetty 12+ a user can craft a URL to access any resource the Jetty instance is allowed to access.\n\nFor example `http://[host]/xwiki/bin/skin/..%252f/..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc/passwd` allows downloading the content of the /etc/passwd file, provided Jetty is allowed to read it, and if your XWiki webapp is located exactly 5 levels below `/` (like `/var/lib/jetty/webapps/xwiki`, which is the case in the docker image, for example).\n\nAnother example which does not go out of the XWiki webapp, but it's still a vulnerability (since users should not be allowed to access Hibernate or XWiki configuration files) is `http://[host]/xwiki/bin/skin/..%252f/..%252fWEB-INF/xwiki.cfg`.\n\n### Patches\n\nThis vulnerability has been patched in XWiki 17.10.5 and 18.2.0.\n\n### Workarounds\n\nA possible workaround is to use a different application server, like Jetty \u003c 12 (in the case of XWiki \u003c 17) or Tomcat, which don't seem to be impacted.\n\n### Resources\n\n* https://jira.xwiki.org/browse/XWIKI-24075\n* https://jira.xwiki.org/browse/XCOMMONS-3594\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n* Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)\n* Send an email to the [Security Mailing List](mailto:security@xwiki.org)\n\n### Attribution\n\n Lê Ngọc Khoa reported the vulnerability.","status":"published","published":"2026-07-07T13:01:21Z","modified":"2026-07-07T13:26:30.500387Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T15:46:54.760124Z"}]}}