What’s Vulnerable › Vulnerabilities

CVE-2026-33676: Vikunja has Cross-Project Information Disclosure via Task Relations — Missing Authorization Check on Related Task Read

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-24 · updated 2026-06-17
• Weakness: CWE-863

Description

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, when the Vikunja API returns tasks, it populates the `related_tasks` field with full task objects for all related tasks without checking whether the requesting user has read permission on those tasks' projects. An authenticated user who can read a task that has cross-project relations will receive full details (title, description, due dates, priority, percent completion, project ID, etc.) of tasks in projects they have no access to. Version 2.2.1 patches the issue.

Affected products

• go-vikunja vikunja: before 2.2.1 — fixed in 2.2.1

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/go-vikunja/vikunja/commit/833f2aec006ac0f6643c41872e45dd79220b9174
• https://github.com/go-vikunja/vikunja/pull/2449
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8cmm-j6c4-rr8v
• https://vikunja.io/changelog/vikunja-v2.2.2-was-released
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8cmm-j6c4-rr8v

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