Medium severity · published Apr 10, 2026
CVE-2026-40103
Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds
5.4
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
< 2.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40103
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40103
Patch
https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae
Issue Tracking
https://github.com/go-vikunja/vikunja/pull/2584
Release Notes
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
Exploit
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83
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