Is CVE-2026-42267 actively exploited?

No active exploitation of CVE-2026-42267 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42267 be exploited remotely?

Yes. CVE-2026-42267 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42267?

CVE-2026-42267 has a CVSS score of 5.7 (MEDIUM).

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MEDIUM

CVE-2026-42267

CWE-1236Published: May 8, 2026· Updated: May 13, 2026

5.7

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42267 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.7.