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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55066
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 20:18:23 UTC
Updated2026-08-31 19:16:53 UTC
DescriptionVikunja 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.002700000 probability, percentile 0.188630000 (date 2026-09-01)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go-vikunja Vikunja affected < 2.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/go-vikunja/vikunja/releases/tag/v2.4.0 [email protected] github.com
github.com/go-vikunja/vikunja/pull/3239 [email protected] github.com
github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg [email protected] github.com
github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59... [email protected] github.com
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