CVE-2026-55066

HIGH 7.1

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

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	go-vikunja
Product	vikunja
Published	Aug 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

go-vikunja / vikunja

< 2.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg github.com: https://github.com/go-vikunja/vikunja/pull/3239 github.com: https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65f github.com: https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0