{"id":"CVE-2026-111918","title":"Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation","summary":"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. Atta…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","cvssSource":"cna","cwe":["CWE-863"],"vendor":"go-vikunja","product":"vikunja","affected":["vikunja >= 1.0.0-rc0 < 2.7.0"],"published":"2026-10-17","updated":"2026-10-17","sourceUpdated":"2026-10-17T18:46:33.245Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111918","references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fprf-r6rv-xg99","label":"GitHub Security Advisory (GHSA-fprf-r6rv-xg99)"},{"url":"https://www.vulncheck.com/advisories/vikunja-1.0.0-rc0-before-2.7.0-cross-tenant-task-position-writes-via-saved-filter-creation","label":"VulnCheck Advisory: Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation"}],"tags":["cve.org"],"ingestedAt":"2026-10-17T19:08:56.664Z","slug":"CVE-2026-111918","body":"## Overview\n\nVikunja 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.\n\n## Affected\n\n- `vikunja >= 1.0.0-rc0 < 2.7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}