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CVE-2026-40103 Details

Description

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae	[email protected]	Patch
https://github.com/go-vikunja/vikunja/pull/2584	[email protected]	Issue Tracking
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0	[email protected]	Release Notes
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83	[email protected]	ExploitVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-836	Use of Password Hash Instead of Password for Authentication	[email protected]

Affected Products

Product	Versions
vikunja vikunja	< 2.3.0
CPE cpe:2.3:a:vikunja:vikunja:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Apr 17, 2026	Initial Analysis	[email protected]
Apr 10, 2026	New CVE Received	[email protected]