{"id":"GHSA-vcgv-7rvm-m3vp","summary":"Duplicate Advisory: Vikunja: Link-share token can enumerate users through the v2 API","details":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-vfxw-3x8p-2vjr. This link is maintained to preserve external references.\n\n### Original Description\nVikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.","modified":"2026-10-09T21:00:07.394329162Z","published":"2026-09-15T18:32:30Z","withdrawn":"2026-10-09T20:52:33Z","database_specific":{"github_reviewed_at":"2026-10-09T20:52:33Z","nvd_published_at":"2026-09-15T16:17:55Z","cwe_ids":["CWE-200"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91981"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/vikunja-before-2.6.0-user-enumeration-via-v2-api"}],"affected":[{"package":{"name":"code.vikunja.io/api","ecosystem":"Go","purl":"pkg:golang/code.vikunja.io/api"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"2.5.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-vcgv-7rvm-m3vp/GHSA-vcgv-7rvm-m3vp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}