{"id":"GHSA-9xwc-vwww-qqmw","title":"Duplicate Advisory: Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure","summary":"Duplicate Advisory: Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure","severity":"high","cvss":7.5,"cwe":["CWE-639"],"vendor":"api","product":"code.vikunja.io/api","ecosystem":"go","affected":["code.vikunja.io/api <= 2.4.0"],"published":"2026-08-19","updated":"2026-10-09","sourceUpdated":"2026-10-09T20:43:23Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-9xwc-vwww-qqmw","references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76216"},{"url":"https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing"},{"url":"https://github.com/advisories/GHSA-9xwc-vwww-qqmw"}],"tags":["ghsa","go"],"ingestedAt":"2026-10-09T21:12:42.333Z","slug":"GHSA-9xwc-vwww-qqmw","body":"## Overview\n\n### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-32r8-5843-4qw2. This link is maintained to preserve external references.\n\n### Original Description\nVikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.\n\n## Affected packages\n\n- `code.vikunja.io/api <= 2.4.0`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}