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Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity incorrect authorization in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.4%top 62.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gocode.vikunja.io/api2.4.0GHSA-f27p-pw2p-9pr4
Gocode.vikunja.io/apino fix listedGO-2026-6311

Affected products (as reported)

VendorProductVersions
go-vikunja vikunja >= 0.21.0, < 2.4.0

Weakness: CWE-285, CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

References