{"id":"CVE-2026-34151","title":"XWiki Platform is a generic wiki platform","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 w…","severity":"high","cvss":8.2,"cvssVector":"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","cwe":["CWE-24"],"vendor":"xwiki","product":"xwiki-platform","affected":["xwiki-platform < 17.10.5","xwiki-platform >= 18.0.0-rc-1, < 18.2.0"],"patched":["org.xwiki.platform:xwiki-platform-oldcore 17.10.5","org.xwiki.platform:xwiki-platform-oldcore 18.2.0"],"published":"2026-09-14","updated":"2026-09-14","sourceUpdated":"2026-09-14T19:17:19.853","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-34151","references":[{"url":"https://github.com/xwiki/xwiki-commons/pull/1675","label":"security-advisories@github.com"},{"url":"https://github.com/xwiki/xwiki-platform/commit/79eba8655f3a96021a8e7ad07956e48d20a82383","label":"security-advisories@github.com"},{"url":"https://github.com/xwiki/xwiki-platform/commit/f7b33704083d3b4e45d1b9fc1e2cc33c66855f85","label":"security-advisories@github.com"},{"url":"https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-17.10.5","label":"security-advisories@github.com"},{"url":"https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-18.2.0","label":"security-advisories@github.com"},{"url":"https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qj4x-9g63-25g6","label":"security-advisories@github.com"},{"url":"https://jira.xwiki.org/browse/XCOMMONS-3594","label":"security-advisories@github.com"},{"url":"https://jira.xwiki.org/browse/XWIKI-24075","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-qj4x-9g63-25g6"}],"tags":["nvd","cve.org","ghsa","maven"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-14T18:56:04.582032Z"},"cvssSource":"cna","aliases":["GHSA-qj4x-9g63-25g6"],"ecosystem":"maven","ingestedAt":"2026-07-07T13:53:11.868Z","epss":0.00542,"epssPercentile":0.44273,"slug":"CVE-2026-34151","body":"## Overview\n\nXWiki 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-34151)\n\nAffected packages:\n\n- `org.xwiki.platform:xwiki-platform-oldcore < 17.10.5`\n- `org.xwiki.platform:xwiki-platform-oldcore >= 18.0.0-rc-1, < 18.2.0`\n\nPatched in:\n\n- `org.xwiki.platform:xwiki-platform-oldcore 17.10.5`\n- `org.xwiki.platform:xwiki-platform-oldcore 18.2.0`\n\nSource: https://github.com/advisories/GHSA-qj4x-9g63-25g6","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203126,"id":"CVE-2026-34151","ts":1789409578142,"field":"cvss","old":null,"new":"8.2"}]}