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.
Advisories

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Fixes

Solution

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Workaround

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History

Thu, 17 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title Vikunja before 2.6.0 Broken Object-Level Authorization via task-position
First Time appeared Vikunja
Vikunja vikunja
Weaknesses CWE-639
CPEs cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
Vendors & Products Vikunja
Vikunja vikunja
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-17T19:27:58.744Z

Reserved: 2026-09-15T11:10:41.354Z

Link: CVE-2026-91984

cve-icon Vulnrichment

Updated: 2026-09-17T19:16:27.824Z

cve-icon NVD

Status : Deferred

Published: 2026-09-15T16:17:55.903

Modified: 2026-09-17T20:18:54.770

Link: CVE-2026-91984

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-17T14:30:13Z

Weaknesses