5.4

CVE-2026-40103: go-vikunja vikunja

CVSS: 5.4v3.1MediumAnalyzed
AliasesGHSA-v479-vf79-mg83GO-2026-5650
Published 10-04-2026Last modified 15-04-2026
Open JSON

Vulnerability summary

CVE-2026-40103 is a medium (CVSS 5.4) vulnerability in go-vikunja vikunja. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (NVD)
EPSS score
0.35%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21483-1

Timeline

  1. 10-04-2026
    PublishedVulnerability first disclosed.
  2. 15-04-2026
    Last modifiedVulnerability information updated.

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

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

+0.13 pp

From 0.22% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.35%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Vikunja

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Code.vikunja.io1 product
  • api< 2.3.0 | All versions (No fix recorded)
Go-vikunja1 product
Vikunja1 product

3 vendors · 3 products

References

6 links