{"id":"CVE-2026-62367","published":"2026-10-09T21:17:05.470","lastModified":"2026-10-13T21:17:39.863","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-287","CWE-290","CWE-345"],"vendors":[],"products":[],"references":[{"url":"https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","tags":[]},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","tags":[]},{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","tags":[]}],"exploitRefs":[{"url":"https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","tags":[]},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","tags":[]},{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","tags":[]}],"hasPoc":true,"ai":null}