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    CVE-2026-42267

    Kimai is an open-source time tracking application. From version 2.27.0 to before version 2.54.0, any ROLE_USER can create a tag with a formula string as its name (e.g. =SUM(54+51)) via POST /api/tags and assign it to a timesheet. When an admin exports timesheets to XLSX, ArrayFormatter.formatValue() joins tag names with implode() and returns the result unchanged. OpenSpout promotes any =-prefixed string to a FormulaCell, writing <f>SUM(54+51)</f> into the XLSX archive. Excel evaluates the formula when the file is opened. This issue has been patched in version 2.54.0.

    Published:May 8, 2026
    Last Modified:May 13, 2026
    EPS:May 8, 2026
    EPSS Score:0.00047
    CVSS Score:5.7

    Affected Products

    Vendor
    Kimai
    Product
    Kimai

    Exploits

    https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3rhttps://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-84808 (CVSS 5.3) — Kimai versions before 2.65.0 contain an authorization bypass vulnerability in the REST API timesheet collectio…
    CVE-2026-84807 (CVSS 5.3) — Kimai (kimai/kimai) through 2.65.0 contains a business logic / improper authorization vulnerability in the def…
    CVE-2026-84806 (CVSS 5.3) — Kimai before 2.63.0 contains an improper authorization vulnerability in team access endpoints that allows auth…
    CVE-2026-84805 (CVSS 5.3) — Kimai versions from 2.61.0 before 2.63.0 fail to disable admin-only work-contract preferences for low-privileg…
    CVE-2026-84804 (CVSS 5.3) — Kimai before 2.65.0 fails to properly validate permissions when removing team access to activities, projects, …
    CVE-2026-80202 (CVSS 9.3) — Kimai before 2.56.0 does not enforce team-membership checks in TimesheetVoter::voteOnAttribute(), which maps p…
    CVE-2026-80201 (CVSS 2) — Kimai before 2.53.0 fails to block sensitive User methods in the Twig invoice template sandbox, allowing admin…
    CVE-2026-80200 (CVSS 5.3) — Kimai before 2.53.0 contains an open redirect vulnerability in the SAML authentication success handler that ac…
    CVE-2026-80199 (CVSS 6.3) — Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated a…
    CVE-2026-80198 (CVSS 8.7) — Kimai versions before 2.56.0 fail to restrict the config() Twig function in sandboxed invoice and export templ…

    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