Auth bypass in Go-Vikunja Vikunja
CVE-2026-111918
Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-fprf-r6rv-xg99 (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-1.0.0-rc0-before-2.7.0-cross-tenant-task-p… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111918?
- CVE-2026-111918 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-17.
- How severe is CVE-2026-111918?
- Medium severity. CVSS v3 base score is 5.4 out of 10.