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CVE-2026-55064

4.3 · MEDIUM

Vikunja is an open-source self-hosted task management platform.

Published Aug 28, 2026CWE-862EPSS 0.37%

Overview

CVE-2026-55064 is a medium-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Vikunja is an open-source self-hosted task management platform. From 2.3.0 until 2.4.0, a user with Write but not Admin permission on a shared child project can detach it from its parent hierarchy by submitting parent_project_id equal to 0 to POST /api/v1/projects/{project}. The Project.CanUpdate authorization check in pkg/models/project_permissions.go and UpdateProject logic in pkg/models/project.go only gate nonzero parent values, while UpdateProject always persists parent_project_id, so the explicit zero value bypasses the Admin requirement introduced for CVE-2026-35595. Detachment severs the recursive permission-inheritance chain and can disrupt the owner’s hierarchy and inherited collaborator access. This issue is fixed in version 2.4.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/go-vikunja/vikunja/commit/781ffac198548ae4f3d1febc613caed8e0e11d01GitHubgithub.com/go-vikunja/vikunja/pull/3239GitHubgithub.com/go-vikunja/vikunja/releases/tag/v2.4.0GitHubgithub.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4GitHubgithub.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55064?

CVE-2026-55064 is a medium-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-55064?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55064?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55064?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55064 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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