{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "9.89"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "dc135f6e7d59f9f56065cd5df83b1f123ea120bb"
            },
            {
              "fixed": "f1f6fecf4489bee736bcafaefe2a80190a8788e5"
            }
          ],
          "repo": "https://github.com/wekan/wekan",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xm8x-c8wg-jhmf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-269",
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68561.json"
  },
  "details": "Wekan is open source kanban built with Meteor. Prior to 9.89, the second Boards.allow({ update }) rule in server/permissions/boards.js called canUpdateBoardSort in server/lib/utils.js, which authorized any board member whenever fieldNames included sort. Because Meteor combines allow rules with OR semantics and applies the complete modifier, a comment-only or read-only member could send one Boards.update with $set values for sort, members, permission, and title, make themselves the sole board administrator, expose a private board, and evict the legitimate owner; the last-admin deny rule inspected only $pull and did not block a wholesale $set of members. Version 9.89 requires sort to be the only modified field and rejects $set member arrays that remove the last active administrator. This issue is fixed in version 9.89.",
  "id": "CVE-2026-68561",
  "modified": "2026-08-21T03:30:26.028302651Z",
  "published": "2026-08-19T19:24:58.933Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wekan/wekan/releases/tag/v9.89"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68561.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/wekan/wekan/security/advisories/GHSA-xm8x-c8wg-jhmf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68561"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wekan/wekan/commit/dc135f6e7d59f9f56065cd5df83b1f123ea120bb"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Wekan: a low-privilege board member escalates to board admin and takes over a private board via the `sort` collection-allow rule"
}