CVE-2026-55064

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Source
https://cve.org/CVERecord?id=CVE-2026-55064
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55064.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55064
Aliases
Downstream
Related
Published
2026-08-28T16:38:38Z
Modified
2026-09-11T03:30:29Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Vikunja incomplete fix for CVE-2026-35595: Write-only user can detach shared project from parent hierarchy via parent_project_id=0
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55064.json"
}
References

Affected packages

Git / github.com/go-vikunja/vikunja

Affected ranges

Type
GIT
Repo
https://github.com/go-vikunja/vikunja
Events
Introduced
28b537837f9808dc106c9058b5829c65759fddf2
Fixed
781ffac198548ae4f3d1febc613caed8e0e11d01
Fixed
907850feae3866ae9b16ea1c7b84a4d77273415a
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "2.3.0"
        },
        {
            "fixed":  "2.4.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55064.json"