# CVE-2026-40103

## Summary

- **CVE ID:** CVE-2026-40103
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-836
- **Published:** Apr 10, 2026
- **Last Modified:** Apr 15, 2026

## 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.

## Affected Products

- go-vikunja — vikunja (< 2.3.0)

## References

- [CNA](https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83)
- [CNA](https://github.com/go-vikunja/vikunja/pull/2584)
- [CNA](https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae)
- [CNA](https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._