{"id":"CVE-2026-62367","title":"Vikunja is an open-source self-hosted task management platform","summary":"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-exi…","severity":"high","cwe":["CWE-287","CWE-290","CWE-345"],"vendor":"api","product":"code.vikunja.io/api","affected":["code.vikunja.io/api >= 1.0.0, <= 2.3.0"],"patched":["code.vikunja.io/api 2.4.0"],"published":"2026-10-09","updated":"2026-10-09","sourceUpdated":"2026-10-09T21:17:05.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62367","references":[{"url":"https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","label":"security-advisories@github.com"},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","label":"security-advisories@github.com"},{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-xv7q-fvmc-jx96"}],"tags":["nvd","ghsa","go"],"aliases":["GHSA-xv7q-fvmc-jx96"],"ecosystem":"go","ingestedAt":"2026-10-09T21:12:42.333Z","slug":"CVE-2026-62367","body":"## Overview\n\nVikunja 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-62367)\n\nAffected packages:\n\n- `code.vikunja.io/api >= 1.0.0, <= 2.3.0`\n\nPatched in:\n\n- `code.vikunja.io/api 2.4.0`\n\nSource: https://github.com/advisories/GHSA-xv7q-fvmc-jx96","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}