{"id":"GHSA-qrvh-r3f2-9h4r","summary":"XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}","details":"### Impact\n\n`POST /wikis/{wikiName}` executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki\n\n### Patches\n\nThis vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1.\n\n### Workarounds\n\nXWiki is not aware of any workarounds other than adding a rule into an HTTP proxy to prevent access POST request in the `/wikis/{wikiName}[/]` endpoint.\n\n### Resources\n\n* https://jira.xwiki.org/browse/XWIKI-23953\n* https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f\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\nReported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).","aliases":["CVE-2026-33137"],"modified":"2026-05-26T19:15:09.325737948Z","published":"2026-05-26T18:58:19Z","database_specific":{"nvd_published_at":"2026-05-20T20:16:37Z","cwe_ids":["CWE-862"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-05-26T18:58:19Z"},"references":[{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qrvh-r3f2-9h4r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33137"},{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f"},{"type":"PACKAGE","url":"https://github.com/xwiki/xwiki-platform"},{"type":"WEB","url":"https://jira.xwiki.org/browse/XWIKI-23953"}],"affected":[{"package":{"name":"org.xwiki.platform:xwiki-platform-rest-server","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-rest-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"15.10.6"},{"fixed":"16.10.17"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qrvh-r3f2-9h4r/GHSA-qrvh-r3f2-9h4r.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-rest-server","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-rest-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"17.0.0-rc-1"},{"fixed":"17.4.9"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qrvh-r3f2-9h4r/GHSA-qrvh-r3f2-9h4r.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-rest-server","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-rest-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"17.5.0"},{"fixed":"17.10.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qrvh-r3f2-9h4r/GHSA-qrvh-r3f2-9h4r.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-rest-server","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-rest-server"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"18.0.0-rc-1"},{"fixed":"18.1.0-rc-1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qrvh-r3f2-9h4r/GHSA-qrvh-r3f2-9h4r.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}