CVE-2026-56765
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.
- Affected products
- Vikunja
- Fix
- Available
- CVSS 3.1
- 9.8 CRITICAL
- EPSS
- 0.4% (29th percentile)
- Weakness
- CWE-639
- NVD status
- Deferred
- Published
- 2026-07-10
CVE-2026-56765 at NVD
No indexed exploits for CVE-2026-56765 yet
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No exploit for CVE-2026-56765 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.