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    CVE-2026-40103

    Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.

    Published:Apr 10, 2026
    Last Modified:Apr 17, 2026
    EPS:Apr 10, 2026
    EPSS Score:0.0003
    CVSS Score:4.3

    Affected Products

    Vendor
    Go-vikunja
    Product
    Vikunja
    Vendor
    Vikunja
    Product
    Vikunja

    Exploits

    https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83

    Related CVEs

    CVE-2026-55067 (CVSS 5) — Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project…
    CVE-2026-55066 (CVSS 7.1) — Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project…
    CVE-2026-55065 (CVSS 8.1) — Vikunja is an open-source self-hosted task management platform. From 0.24.6 until 2.4.0, DELETE /api/v1/projec…
    CVE-2026-55064 (CVSS 4.3) — Vikunja is an open-source self-hosted task management platform. From 2.3.0 until 2.4.0, a user with Write but …
    CVE-2026-54766 (CVSS 5.3) — Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplicati…
    CVE-2026-68581 (CVSS 8.6) — Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because use…
    CVE-2026-35602 (CVSS 5.4) — Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the Vikunja file import endpoi…
    CVE-2026-35601 (CVSS 4.1) — Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator bu…
    CVE-2026-35600 (CVSS 5.4) — Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, task titles are embedded direc…
    CVE-2026-35599 (CVSS 6.5) — Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the addRepeatIntervalToTime fu…

    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