medium5.7
CVE-2026-42267
Kimai vulnerable to formula Injection via tag names in XLSX export
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | kimai/kimai | >= 2.27.0, <= 2.53.0 | 2.54.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kimai | Kimai | from 2.27.0 before 2.54.0 |