{
"id": "GHSA-qrvh-r3f2-9h4r",
"aliases": [
"CVE-2026-33137"
],
"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:[email protected] )\n\n### Attribution\n\nReported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).",
"summary": "XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "15.10.6"
},
{
"fixed": "16.10.17"
}
]
}
],
"package": {
"name": "org.xwiki.platform:xwiki-platform-rest-server",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "17.0.0-rc-1"
},
{
"fixed": "17.4.9"
}
]
}
],
"package": {
"name": "org.xwiki.platform:xwiki-platform-rest-server",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "17.5.0"
},
{
"fixed": "17.10.3"
}
]
}
],
"package": {
"name": "org.xwiki.platform:xwiki-platform-rest-server",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "18.0.0-rc-1"
},
{
"fixed": "18.1.0-rc-1"
}
]
}
],
"package": {
"name": "org.xwiki.platform:xwiki-platform-rest-server",
"ecosystem": "Maven"
}
}
],
"modified": "2026-05-26T18:58:19Z",
"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"
}
],
"published": "2026-05-26T18:58:19Z",
"references": [
{
"url": "https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qrvh-r3f2-9h4r",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33137",
"type": "ADVISORY"
},
{
"url": "https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f",
"type": "WEB"
},
{
"url": "https://github.com/xwiki/xwiki-platform",
"type": "PACKAGE"
},
{
"url": "https://jira.xwiki.org/browse/XWIKI-23953",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-862"
],
"severity": "CRITICAL",
"github_reviewed": true,
"nvd_published_at": "2026-05-20T20:16:37Z",
"github_reviewed_at": "2026-05-26T18:58:19Z"
}
}