What’s Vulnerable › Vulnerabilities

CVE-2026-54766: Vikunja: Project duplication bypasses write-permission check on the target parent project

• Severity: medium (CVSS 5.3 v4.0)
• 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: none known
• Published: 2026-08-28 · updated 2026-09-09
• Weakness: CWE-285

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.

Affected products

• go-vikunja vikunja: from 0.21.0, < 2.4.0

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

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