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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j
- https://www.vulncheck.com/advisories/vikunja-unauthenticated-instance-wide-data-
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j
FAQ
What is CVE-2026-56765?
CVE-2026-56765 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 Get...
How severe is CVE-2026-56765?
CVE-2026-56765 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-56765?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.