CVE-2026-40103 | THREATINT

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.

PUBLISHED Reserved 2026-04-09 | Published 2026-04-10 | Updated 2026-04-15 | Assigner GitHub_M

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-836: Use of Password Hash Instead of Password for Authentication

Product status

< 2.3.0

affected

References

github.com/...ikunja/security/advisories/GHSA-v479-vf79-mg83

github.com/go-vikunja/vikunja/pull/2584

github.com/...ommit/6a0f39b252a81fa4b19dc56dc889183acc9225ae

github.com/go-vikunja/vikunja/releases/tag/v2.3.0

cve.org (CVE-2026-40103)

nvd.nist.gov (CVE-2026-40103)

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