CVE-2026-62367 · GHSA-xv7q-fvmc-jx96

Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover

Risk score: 50/100
CVSS: 7.5 v4.0
Exploit chance (30 days): 0.1%
Published: 9 Oct 2026

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What to know

What it is: 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…
Affected: code.vikunja.io/api (go) >= 1.0.0, <= 2.3.0
Fix: Upgrade code.vikunja.io/api to 2.4.0 or later.
Exploitation: No known exploitation

Why it is Yellow

CVSS 7.5 high
On your watchlist: Go

Affected packages

Package	Ecosystem	Vulnerable	Fixed in
code.vikunja.io/api	go	>= 1.0.0, <= 2.3.0	2.4.0

References

Original 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.

Last activity 9 Oct 2026. Patch Forecast updates every hour.