CVE-2026-54766: Access Control Flaw

Description

Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplication operation in pkg/models/project_duplicate.go allows an authenticated user who can read a source project to place its duplicate beneath an arbitrary target parent project. ProjectDuplicate.CanCreate calls parent.CanCreate on an unhydrated Project containing only the body supplied parent_project_id instead of calling parent.CanWrite, so the target parent write-permission check is skipped. The ordinary project creation path enforces that permission, but PUT /api/v1/projects/{project}/duplicate does not, allowing attacker-owned content to be injected into another user or team project hierarchy. This issue is fixed in version 2.4.0.

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Weakness Type (CWE)

CWE-285 CWE-285

CWE-863 Incorrect Authorization

References

Other References

https://github.com/go-vikunja/vikunja/commit/d911caaa11c748c3abc6b98b3189afea2677bcb0 https://github.com/go-vikunja/vikunja/pull/3239 https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0 https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f27p-pw2p-9pr4 https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f27p-pw2p-9pr4

Frequently Asked Questions

What is CVE-2026-54766? +

Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplication operation in pkg/models/project_duplicate.go allows an authenticated user who can read a source project to place its duplicate beneath an arbitrary target parent project. ProjectDuplicate.CanCreate calls parent.CanCreate on an unhydrated Project containing only the body supplied parent_project_id instead of calling parent.CanWrite, so the target parent write-permission check is skipped. The ordinary project creation path enforces that permission, but PUT /api/v1/projects/{project}/duplicate does not, allowing attacker-owned content to be injected into another user or team project hierarchy. This issue is fixed in version 2.4.0.

How do I check if I'm vulnerable to CVE-2026-54766? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-54766