{"id":"CVE-2026-111920","summary":"Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions","details":"Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go), which resolves a user's effective project permission as the maximum over the project tree, silently overriding explicit lower-permission shares on sub-projects. A collaborator with write access on a parent project but read-only access to a child project can modify the child project's tasks and content.","aliases":["GHSA-pjr3-86v4-5p7w","GO-2026-6745"],"modified":"2026-10-19T21:40:55.107455187Z","published":"2026-10-17T18:46:34.636Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-269"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111920.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111920.json"},{"type":"ADVISORY","url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-pjr3-86v4-5p7w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111920"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/vikunja-2.6.0-broken-access-control-via-inherited-project-permissions"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/go-vikunja/vikunja","events":[{"introduced":"a4218eeb8fb3ada95e14a2331731524c9120d5bd"},{"last_affected":"a4218eeb8fb3ada95e14a2331731524c9120d5bd"}],"database_specific":{"extracted_events":[{"introduced":"2.6.0"},{"last_affected":"2.6.0"}],"source":"AFFECTED_FIELD"}}],"versions":["2.6.0","v2.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111920.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}