Critical severity9.8NVD Advisory· Published Jul 10, 2026· Updated Jul 10, 2026

CVE-2026-56765

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.

Affected products

Go Vikunja/Vikunjallm-fuzzy
Range: <2.2.1

Patches

Vulnerability mechanics

References

github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8jnvd
www.vulncheck.com/advisories/vikunja-unauthenticated-instance-wide-data-breach-via-link-share-hash-disclosure-chained-with-cross-project-attachment-idornvd

News mentions

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