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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| go-vikunja | vikunja | >= 1.0.0, < 2.4.0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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federiconbaez/cortex9-vikunja-oidc-email-verified-linking-model ★ 0 · Nov 9, 2026
Offline differential model of Vikunja OIDC email_verified account linking (CVE-2026-62367), educational
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | code.vikunja.io/api | >= 1.0.0, < 2.4.0 | 2.4.0 | GHSA-xv7q-fvmc-jx96 |
| Go | code.vikunja.io/api | all versions | — | GO-2026-6758 |