GHSA-QRVH-R3F2-9H4R

Vulnerability from github – Published: 2026-05-26 18:58 – Updated: 2026-05-26 18:58
VLAI
Summary
XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}
Details

Impact

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

Patches

This vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1.

Workarounds

XWiki 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.

Resources

  • https://jira.xwiki.org/browse/XWIKI-23953
  • https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f

For more information

If there are any questions or comments about this advisory: * Open an issue in Jira XWiki.org * Send an email to the Security Mailing List

Attribution

Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).

Severity
9.3 (Critical)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.xwiki.platform:xwiki-platform-rest-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "15.10.6"
            },
            {
              "fixed": "16.10.17"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.xwiki.platform:xwiki-platform-rest-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "17.0.0-rc-1"
            },
            {
              "fixed": "17.4.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.xwiki.platform:xwiki-platform-rest-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "17.5.0"
            },
            {
              "fixed": "17.10.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.xwiki.platform:xwiki-platform-rest-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "18.0.0-rc-1"
            },
            {
              "fixed": "18.1.0-rc-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33137"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-26T18:58:19Z",
    "nvd_published_at": "2026-05-20T20:16:37Z",
    "severity": "CRITICAL"
  },
  "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.).",
  "id": "GHSA-qrvh-r3f2-9h4r",
  "modified": "2026-05-26T18:58:19Z",
  "published": "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.