{"cve":"CVE-2026-62367","nvd":{"published":"2026-10-09T21:17:05.470","modified":"2026-10-16T20:04:29.760","status":"Deferred","description":"Vikunja is an open-source self-hosted task management platform. In versions 1.0.0 through 2.3.0, when an administrator enables the per-provider `emailfallback` option on an OpenID Connect provider, Vikunja links an SSO login to a pre-existing local (username+password) account using only the `email` claim from the IdP. The fallback never checks an `email_verified` (or Microsoft `xms_edov`) signal and never requires the matched account's password. An attacker who can obtain a token from the configured issuer carrying a victim's email logs in as that victim with a full session, with no consent or interaction from the victim. Version 2.4.0 fixes the issue.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":7.5},"cvss_v3":null,"cwes":["CWE-287","CWE-290","CWE-345"],"references":["https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-62367","score":0.00089,"percentile":0.00384,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-xv7q-fvmc-jx96","url":"https://osv.dev/vulnerability/GHSA-xv7q-fvmc-jx96","summary":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover","modified":"2026-10-19T21:40:54.288683723Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":[">=1.0.0 <2.4.0"],"fixed":["2.4.0"]}]},{"id":"GO-2026-6758","url":"https://osv.dev/vulnerability/GO-2026-6758","summary":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover in code.vikunja.io/api","modified":"2026-10-19T21:31:49.973995144Z","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."]}