---
id: GHSA-ccgq-fx7h-2v4c
title: >-
  Duplicate Advisory: Vikunja: Cross-tenant task-position rows can be injected
  into arbitrary project views via the unvalidated project_view_id in the task
  position endpoint (v1 and v2)
summary: >-
  Duplicate Advisory: Vikunja: Cross-tenant task-position rows can be injected
  into arbitrary project views via the unvalidated project_view_id in the task
  position endpoint (v1 and v2)
severity: medium
cvss: 4.3
cwe:
  - CWE-639
vendor: api
product: code.vikunja.io/api
ecosystem: go
affected:
  - code.vikunja.io/api <= 2.5.0
published: '2026-09-15'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T20:51:35Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-ccgq-fx7h-2v4c'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91984'
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-broken-object-level-authorization-via-task-position
  - url: 'https://github.com/advisories/GHSA-ccgq-fx7h-2v4c'
tags:
  - ghsa
  - go
ingestedAt: '2026-10-09T21:12:42.331Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-w39f-h553-h2mx. This link is maintained to preserve external references.

### Original Description
Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.

## Affected packages

- `code.vikunja.io/api <= 2.5.0`

## Remediation

Refer to the advisory for the patched release.