---
id: CVE-2026-55064
title: Vikunja is an open-source self-hosted task management platform
summary: >-
  Vikunja is an open-source self-hosted task management platform. From 2.3.0
  until 2.4.0, a user with Write but not Admin permission on a shared child
  project can detach it from its parent hierarchy by submitting
  parent_project_id equal to…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-862
vendor: api
product: code.vikunja.io/api
affected:
  - 'code.vikunja.io/api >= 2.3.0, < 2.4.0'
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-2026-55064'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/commit/781ffac198548ae4f3d1febc613caed8e0e11d01
    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-44v6-7fxq-vgf4
    label: security-advisories@github.com
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-44v6-7fxq-vgf4'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00268
epssPercentile: 0.19188
aliases:
  - GHSA-44v6-7fxq-vgf4
ecosystem: go
ingestedAt: '2026-08-28T17:22:56.524Z'
---

## Overview

Vikunja is an open-source self-hosted task management platform. From 2.3.0 until 2.4.0, a user with Write but not Admin permission on a shared child project can detach it from its parent hierarchy by submitting parent_project_id equal to 0 to POST /api/v1/projects/{project}. The Project.CanUpdate authorization check in pkg/models/project_permissions.go and UpdateProject logic in pkg/models/project.go only gate nonzero parent values, while UpdateProject always persists parent_project_id, so the explicit zero value bypasses the Admin requirement introduced for CVE-2026-35595. Detachment severs the recursive permission-inheritance chain and can disrupt the owner’s hierarchy and inherited collaborator access. 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-2026-55064)

Affected packages:

- `code.vikunja.io/api >= 2.3.0, < 2.4.0`

Patched in:

- `code.vikunja.io/api 2.4.0`

Source: https://github.com/advisories/GHSA-44v6-7fxq-vgf4