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CVE-2026-40103

Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds

Published: Apr 10, 2026Updated: Apr 17, 2026 Sources: CVE List NVDCWE-836
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 87.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-836

Affected Products

vikunjago-vikunja
On-prem
Cloud & SaaS / saas-application
vikunjavikunja
On-prem
Enterprise Software / collaboration-groupware
go-vikunjaoss-projectCloud & SaaSaka vikunja
vikunjaoss-projectEnterprise Software

Exploitability

Official Patch Available

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83
github.com
https://github.com/go-vikunja/vikunja/pull/2584
github.com
https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae
github.com
and 1 more references View all →

Timeline

Published
Apr 10, 2026
Last Updated
Apr 17, 2026

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