VulnerabilityAnalyzed

CVE-2026-40103

This is a scoped-token authorization bypass.

MEDIUM 5.4EPSS 0.22%

Does this matter?

Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
EPSS: 0.22% probability · 13th percentile
CISA KEV: Not listed
Weakness: CWE-836
Affected: vikunja/vikunja
Source: security-advisories@github.com

References

https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225aePatch
https://github.com/go-vikunja/vikunja/pull/2584Issue Tracking
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0Release Notes
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83Exploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.