High 7.1Published Aug 28, 2026

CVE-2026-55066Vikunja: Cross-tenant IDOR in kanban move-task endpoint via unauthorized body task_id

Updated under an hour ago (2026-10-19 07:23 UTC)

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Every CVE for go-vikunja vikunja

Exploited in the last 30 days

Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied task_id but TaskBucket.CanUpdate in pkg/models/kanban_task_bucket.go authorizes only the project, view, and bucket from the URL. updateTaskBucket then calls Task.ReadOne without a separate task permission check, returns the victim task contents, and can update the task done state when the attacker chooses a done bucket. Because task identifiers are global sequential values, an authenticated user can enumerate cross-tenant tasks and modify their completion metadata through both the v1 and v2 routes that share this model. This issue is fixed in version 2.4.0.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

go-vikunja vikunja go_vikunja:vikunja (from the name)	before 2.4.0	CNA record

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrgx-refsource-confirm
https://github.com/go-vikunja/vikunja/pull/3239x-refsource-misc
https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65fx-refsource-misc
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.