CVE-2026-62367
Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover
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 | CWE-287 CWE-290 CWE-345 |
| Vendor | go-vikunja |
| Product | vikunja |
| Published | Oct 9, 2026 |
Get instant alerts for go-vikunja vikunja
Be the first to know when new unknown vulnerabilities affecting go-vikunja vikunja are published — delivered to Slack, Telegram or Discord.