{"cve":"CVE-2026-76216","nvd":{"published":"2026-08-19T14:17:47.743","modified":"2026-09-16T20:18:30.540","status":"Deferred","description":"Vikunja 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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":7.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.5},"cwes":["CWE-639"],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2","https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-76216","score":0.00363,"percentile":0.30126,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-32r8-5843-4qw2","url":"https://osv.dev/vulnerability/GHSA-32r8-5843-4qw2","summary":"Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure","modified":"2026-10-27T15:30:05.146149430Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["<2.5.0"],"fixed":["2.5.0"]}]},{"id":"GO-2026-6711","url":"https://osv.dev/vulnerability/GO-2026-6711","summary":"Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure in code.vikunja.io/api","modified":"2026-10-19T21:31:36.956679465Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}