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    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.

    Published:Oct 9, 2026
    Last Modified:Oct 13, 2026
    EPS:Oct 9, 2026
    EPSS Score:0.00089
    CVSS Score:7.5

    Affected Products

    Vendor
    Go-vikunja
    Product
    Vikunja

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-22 Exploiting Trust in Client
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-459 Creating a Rogue Certification Authority Certificate
    CAPEC-461 Web Services API Signature Forgery Leveraging Hash Function Extension Weakness
    CAPEC-473 Signature Spoof
    CAPEC-476 Signature Spoofing by Misrepresentation
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-593 Session Hijacking
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-667 Bluetooth Impersonation AttackS (BIAS)
    CAPEC-701 Browser in the Middle (BiTM)
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

    CVE-2026-111922 (CVSS 7.2) — Vikunja from 2.2.0 before 2.7.0 contains a permissive CORS configuration that trusts every localhost and 127.0…
    CVE-2026-111921 (CVSS 5.3) — Vikunja 0.13.0 before 2.7.0 contains an incorrect authorization vulnerability that allows project members with…
    CVE-2026-111920 (CVSS 5.3) — Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go),…
    CVE-2026-111918 (CVSS 5.3) — Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositio…
    CVE-2026-62376 (CVSS 8.1) — Vikunja is an open-source self-hosted task management platform. Versions prior to 2.4.0 store password-reset, …
    CVE-2026-57458 (CVSS 8.1) — Vikunja is an open-source self-hosted task management platform. In version 2.3.0, a scoped API token limited t…
    CVE-2026-91985 (CVSS 8.7) — Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpo…
    CVE-2026-91982 (CVSS 5.3) — Vikunja before 2.6.0 continues to expose the raw TOTP shared secret after enrollment through the GET /api/v1/u…
    CVE-2026-91980 (CVSS 5.3) — vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated us…
    CVE-2026-91979 (CVSS 7.1) — Vikunja before 2.6.0 fails to limit archive expansion during data import, allowing authenticated users to caus…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High