Vikunja: Project duplication bypasses write-permission check on the target parent project (CVE-2026-54766) | HOL Guard CVE

Medium severityCVE-2026-54766GHSA-F27P-PW2P-9PR4

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

Answer in brief

CVE-2026-54766 records a Medium severity vulnerability in Vikunja: Project duplication bypasses write-permission check on the target parent project. The current sources do not mark it as known exploited. The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Medium
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
go-vikunja/vikunjageneric	>= 0.21.0, < 2.4.0	Not reported
code.vikunja.io/apigo	>=0.21.0,<=2.3.0	2.4.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for go-vikunja/vikunja, code.vikunja.io/api.
Review the reported fix. Update code.vikunja.io/api to 2.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.