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Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M

CVE-2026-55067Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-assignment

Medium 5.0

In plain English

A medium-severity authorization bypass via user-controlled key in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.3%top 72.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gocode.vikunja.io/api2.4.0GHSA-569v-q83c-3j3g
Gocode.vikunja.io/apino fix listedGO-2026-6307

Affected products (as reported)

VendorProductVersions
go-vikunja vikunja < 2.4.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

References