---
id: CVE-2026-111918
title: >-
  Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved
  Filter Creation
summary: >-
  Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization
  vulnerability in RecalculateTaskPositions that allows authenticated users with
  zero accessible projects to write task_positions rows for all tasks
  instance-wide. Atta…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-863
vendor: go-vikunja
product: vikunja
affected:
  - vikunja >= 1.0.0-rc0 < 2.7.0
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T18:46:33.245Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111918'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fprf-r6rv-xg99
    label: GitHub Security Advisory (GHSA-fprf-r6rv-xg99)
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-1.0.0-rc0-before-2.7.0-cross-tenant-task-position-writes-via-saved-filter-creation
    label: >-
      VulnCheck Advisory: Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task
      Position Writes via Saved Filter Creation
tags:
  - cve.org
ingestedAt: '2026-10-17T19:08:56.664Z'
---

## Overview

Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.

## Affected

- `vikunja >= 1.0.0-rc0 < 2.7.0`

## Remediation

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