CVE-2026-56765

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.8 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

July 10, 2026

Last Modified

July 10, 2026

CWE ID

CWE-639

Source

NVD

Vendor

Vikunja

Product

Vikunja

External References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j
https://www.vulncheck.com/advisories/vikunja-unauthenticated-instance-wide-data-breach-via-link-share-hash-disclosure-chained-with-cross-project-attachment-idor
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j

CVE-2026-56765

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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