What is CVE-2026-33313?

CVE-2026-33313 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-03-24.

How severe is CVE-2026-33313?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Go-Vikunja Vikunja

CVE-2026-33313

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.0, an authenticated user can read any task comment by ID, regardless of whether they have access to the task the comment belongs to, by substituting the task ID in the API URL with a task they do have access to. Version 2.2.0 fixes the issue.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001

Affected products

Go-Vikunja Vikunja — versions < 2.2.0
Vikunja

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/go-vikunja/vikunja/security/advisories/GHSA-mr3j-p26x-72x4 (Vendor Advisory)
github.com/go-vikunja/vikunja/commit/bc6d843ed4df82a6c89f10aa676a7a33d27bf2fd (Patch)
vikunja.io/changelog/vikunja-v2.2.0-was-released (Release Notes)

Frequently asked questions

What is CVE-2026-33313?: CVE-2026-33313 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-03-24.
How severe is CVE-2026-33313?: Medium severity. CVSS v3 base score is 4.3 out of 10.