{"id":"CVE-2026-91985","revision":"61ce645434534ffaab7aec7185eb73cf","records":[{"revision":"61ce645434534ffaab7aec7185eb73cf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91985","aliases":[],"title":"Vikunja before 2.6.0 Privilege Escalation via Link Share Hash","description":"Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate privileges and perform unauthorized writes or administrative actions.","state":0,"publishedAt":"2026-09-15T15:18:28.282+00:00","modifiedAt":"2026-09-15T16:04:15.007+00:00","affected":[{"ecosystem":"Vendor product","name":"vikunja","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"go-vikunja\",\n                    \"product\": \"vikunja\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.6.0\"\n                        },\n                        {\n                            \"version\": \"2.6.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g","https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91985","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91985","identifiers":["CVE-2026-91985"]},"retained":false,"historicalAffected":[]}],"coverage":[]}