Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-assignment

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55067
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 20:18:24 UTC
Updated2026-08-28 22:16:50 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} allows the request body project_view_id value to be mass assigned by Bucket.Update in pkg/models/kanban.go. The permission check validates that the bucket currently belongs to the URL project and view but does not validate the body selected destination view, allowing any authenticated user to relocate an attacker-owned bucket into another tenant’s Kanban view. The injected bucket retains attacker-controlled content and ownership, enabling cross-tenant defacement. This issue is fixed in version 2.4.0.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

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

EPSS: 0.002460000 probability, percentile 0.157510000 (date 2026-08-31)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
3.1CNADECLARED5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/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/commit/b31d606b8879ebe98fbb2ac5d8b3066b86f... [email protected] github.com
github.com/go-vikunja/vikunja/pull/3239 [email protected] github.com
github.com/go-vikunja/vikunja/security/advisories/GHSA-569v-q83c-3j3g 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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