go-vikunja Vikunja up to 2.3.x Kanban Move-Task Endpoint task_id authorization

Summaryinfo

A vulnerability classified as critical was found in go-vikunja Vikunja up to 2.3.x. This issue affects some unknown processing of the component Kanban Move-Task Endpoint. The manipulation of the argument task_id results in authorization. This vulnerability is cataloged as CVE-2026-55066. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in go-vikunja Vikunja up to 2.3.x. Affected is an unknown function of the component Kanban Move-Task Endpoint. The manipulation of the argument task_id with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-55066 since 06/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 2.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• go-vikunja

Name

• Vikunja

Version

• 2.0
• 2.1
• 2.2
• 2.3

Website

• Product: https://github.com/go-vikunja/vikunja/

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