CVE-2026-42267

MEDIUM

Kimai: Formula Injection via tag names in XLSX export

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/kimai/kimai/releases/tag/2.54.0

Scores

CVSS v3 5.7
EPSS 0.0022
EPSS Percentile 12.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-1236
Status published
Products (3)
kimai/kimai 2.27.0 - 2.54.0Packagist
kimai/kimai 2.27.0 - 2.54.0
kimai/kimai >= 2.27.0, < 2.54.0
Published May 08, 2026
Tracked Since May 08, 2026