CVE-2026-40103

MEDIUM EPSS 12.7%
Published Apr 10, 20262mo ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Apr 10, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.4
Exploitability
2.8
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability Low

Threat Intelligence

EPSS Exploit Probability
12.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-836

Affected Products 1

VendorProductVersionRange
vikunjavikunja* <2.3.0

References 4

  • github.com https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae
    Patch
  • github.com https://github.com/go-vikunja/vikunja/pull/2584
    Issue Tracking
  • github.com https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
    Release Notes
  • github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae
    Patch