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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d5…
security-advisories@github.com
https://github.com/go-vikunja/vikunja/pull/3239
security-advisories@github.com
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0
security-advisories@github.com
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg
security-advisories@github.com