What is CVE-2026-56765?

CVE-2026-56765 is a critical-severity vulnerability in Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2026-07-10.

How severe is CVE-2026-56765?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Vikunja

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 permis…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Vikunja — versions 0, 2.2.1

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56765?: CVE-2026-56765 is a critical-severity vulnerability in Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2026-07-10.
How severe is CVE-2026-56765?: Critical severity. CVSS v3 base score is 9.8 out of 10.