CVE-2026-62367

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.

• CWE-287
• CWE-290
• CWE-345

• 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

Published

Oct 9, 2026

Last Modified

Oct 16, 2026

Status

Deferred

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