CVE-2026-56765

CriticalCVSS 9.8/10Last modified Jul 10, 2026

Description

Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exposes share hashes to users with read access, enabling permission escalation to admin-level shares. The GetTaskAttachment endpoint performs permission checks against user-supplied task IDs but fetches attachments by sequential ID without verifying ownership, allowing attackers to download and delete all file attachments across all projects instance-wide.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-639

Affected software

No affected versions have been published.

Timeline

Published: Jul 10, 2026
Last modified: Jul 10, 2026
NVD status: Deferred

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