---
id: CVE-2026-55066
title: Vikunja is an open-source self-hosted task management platform
summary: >-
  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…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-639
vendor: api
product: code.vikunja.io/api
affected:
  - code.vikunja.io/api <= 2.3.0
patched:
  - code.vikunja.io/api 2.4.0
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55066'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65f
    label: security-advisories@github.com
  - url: 'https://github.com/go-vikunja/vikunja/pull/3239'
    label: security-advisories@github.com
  - url: 'https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-5pg6-m483-7vrg'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00369
epssPercentile: 0.27978
aliases:
  - GHSA-5pg6-m483-7vrg
ecosystem: go
ingestedAt: '2026-08-28T17:22:56.443Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55066)

Affected packages:

- `code.vikunja.io/api <= 2.3.0`

Patched in:

- `code.vikunja.io/api 2.4.0`

Source: https://github.com/advisories/GHSA-5pg6-m483-7vrg