What is CVE-2026-91984?

CVE-2026-91984 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-15.

How severe is CVE-2026-91984?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Go-Vikunja Vikunja

CVE-2026-91984

Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Go-vikunja Vikunja

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-2026-91984?: CVE-2026-91984 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-15.
How severe is CVE-2026-91984?: Medium severity. CVSS v3 base score is 4.3 out of 10.