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CVE-2026-42267

5.7 · MEDIUM

Kimai is an open-source time tracking application.

Published May 8, 2026CWE-1236EPSS 0.33%

Overview

CVE-2026-42267 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/kimai/kimai/releases/tag/2.54.0GitHubgithub.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3rGitHubgithub.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42267?

CVE-2026-42267 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2026-42267?

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-42267?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42267?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42267 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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