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.
{
"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"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "9.89"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "dc135f6e7d59f9f56065cd5df83b1f123ea120bb"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "v9.89",
"range": [
{
"fixed": "f1f6fecf4489bee736bcafaefe2a80190a8788e5"
}
],
"source": "REFERENCES_TAG"
}
]
}