Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-assignment (CVE-2026-55067) | HOL Guard CVE

Medium · CVSS 5.0CVE-2026-55067GHSA-569V-Q83C-3J3G

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

Answer in brief

CVE-2026-55067 records a Medium severity (CVSS 5.0) vulnerability in Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-assignment. The current sources do not mark it as known exploited. The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.0
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
go-vikunja/vikunjageneric	< 2.4.0	Not reported
code.vikunja.io/apigo	<=2.3.0	2.4.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for go-vikunja/vikunja, code.vikunja.io/api.
Review the reported fix. Update code.vikunja.io/api to 2.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

Vikunja 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.

Quoted source text, attributed separately from HOL analysis.