---
id: CVE-2026-111920
title: Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions
summary: >-
  Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser
  (pkg/models/project_access.go), which resolves a user's effective project
  permission as the maximum over the project tree, silently overriding explicit
  lower-…
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'
cvssSource: cna
cwe:
  - CWE-269
vendor: go-vikunja
product: vikunja
affected:
  - vikunja 2.6.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-18T11:17:24.862920Z'
exploitAvailable: true
published: '2026-10-17'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T11:17:27.926Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111920'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-pjr3-86v4-5p7w
    label: GitHub Security Advisory (GHSA-pjr3-86v4-5p7w)
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-2.6.0-broken-access-control-via-inherited-project-permissions
    label: >-
      VulnCheck Advisory: Vikunja 2.6.0 Broken Access Control via Inherited
      Project Permissions
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-10-17T19:08:56.620Z'
---

## Overview

Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go), which resolves a user's effective project permission as the maximum over the project tree, silently overriding explicit lower-permission shares on sub-projects. A collaborator with write access on a parent project but read-only access to a child project can modify the child project's tasks and content.

## Affected

- `vikunja 2.6.0`

## Remediation

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