{"id":"GHSA-9jrx-vmh8-c6xw","summary":"Duplicate Advisory: Vikunja: Link-share principal ID collision allows cross-account API token issuance and management","details":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-vvcv-vpph-h844. This link is maintained to preserve external references.\n\n### Original Description\nVikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user's ID is treated as that user by the /api/v1/tokens endpoints. An authenticated attacker can obtain a target's numeric user ID via authenticated user search, then create link shares on an attacker-writable project until the link-share sequence reaches that value, and use the resulting link-share JWT to list, create, and delete the target user's API tokens (including issuing a new token with attacker-chosen scopes under the target's permissions). Fixed in version 2.4.0.","modified":"2026-10-09T21:00:04.715839737Z","published":"2026-08-02T15:30:21Z","withdrawn":"2026-10-09T20:42:06Z","database_specific":{"nvd_published_at":"2026-08-02T13:16:54Z","cwe_ids":["CWE-863"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-09T20:42:06Z"},"references":[{"type":"WEB","url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vvcv-vpph-h844"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68581"},{"type":"WEB","url":"https://github.com/go-vikunja/vikunja/commit/95b7e673fb5ee407498fa4b13e8b4c57847a4a0b"},{"type":"WEB","url":"https://github.com/go-vikunja/vikunja/commit/e6b25bd57b537ef9a72b5acdadf446ca5ef77bfa"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/vikunja-through-authentication-bypass-via-principal-id-collision"}],"affected":[{"package":{"name":"code.vikunja.io/api","ecosystem":"Go","purl":"pkg:golang/code.vikunja.io/api"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.22.0"},{"last_affected":"2.3.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9jrx-vmh8-c6xw/GHSA-9jrx-vmh8-c6xw.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:H/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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"}]}