CVEvulnerability

CVE-2026-62367

7.5 HIGH Published 2026-10-09 Modified 2026-10-16 Official page ↗
Status
Deferred
Published
2026-10-09
Last modified
2026-10-16
Assigner
[email protected]
CVSS 4.0 ([email protected])
7.5 HIGH — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-287, CWE-290, CWE-345

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.

Related

Weakness · CWE (3)

  • CWE-287 Improper Authentication weakness
  • CWE-290 Authentication Bypass by Spoofing weakness
  • CWE-345 Insufficient Verification of Data Authenticity weakness

References