Security Advisory

CVE-2026-42267

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-08 03:28:52

Last updated 2026-05-08 12:58:12

Assigner GitHub_M

CVSS score 5.4

State PUBLISHED

Description

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.

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