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.
- CVSS 4.0
- 7.5
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - EPSS
- 0.09% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-287, CWE-290, CWE-345
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-xv7q-fvmc-jx96 | Go | code.vikunja.io/api | >=1.0.0 <2.4.0 | 2.4.0 |
| GO-2026-6758 | Go | code.vikunja.io/api | all versions | no fix published |