CVE-2026-56765

criticalCVSS 9.8covered by 1 sourcefirst seen 2026-07-10

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.

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Exploitation outlook

Low exploitation risk0.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-56765: Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exp…nvd · 2026-07-10

External references

NVD record for CVE-2026-56765

CVE.org record

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