CVE-2026-33313: Vikunja has an IDOR in Task Comments Allows Reading Arbitrary Comments

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-24 · updated 2026-06-17
Weakness: CWE-639

Description

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.

Affected products

go-vikunja vikunja: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.2.0. Check the vendor advisory for mitigations.

References

https://github.com/go-vikunja/vikunja/commit/bc6d843ed4df82a6c89f10aa676a7a33d27bf2fd
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-mr3j-p26x-72x4
https://vikunja.io/changelog/vikunja-v2.2.0-was-released

Get alerted when CVE-2026-33313 or the next vulnerability affects your stack