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.

CVSS v3 5.7 MEDIUM

5.7^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.1 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/kimai/kimai/releases/tag/2.54.0	Product Release Notes
https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r	Exploit Mitigation Vendor Advisory
https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:kimai:kimai:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-08 04:16

Updated : 2026-06-17 10:47

NVD link : CVE-2026-42267

Mitre link : CVE-2026-42267

CVE.ORG link : CVE-2026-42267

JSON object : View

Products Affected

kimai

kimai

CWE

CWE-1236

Improper Neutralization of Formula Elements in a CSV File

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