Is CVE-2026-40103 actively exploited?

CVE-2026-40103 has no public evidence of in-the-wild exploitation as of 2026-04-17.

What is the CVSS score for CVE-2026-40103?

CVE-2026-40103 has a CVSS score of 4.3 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2026-40103?

Patch guidance is available from vikunja security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40103.

CVE-2026-40103 - remediation guidance & executive summary

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-836

Metadata

Primary Vendor: VIKUNJA
Published: 4/10/2026
Last Modified: 4/17/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-40103

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary