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.

• CWE-1236

• https://github.com/kimai/kimai/releases/tag/2.54.0Product, Release Notes
• https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3rExploit, Mitigation, Vendor Advisory
• https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3rExploit, Mitigation, Vendor Advisory

Published

May 8, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-42259Saltcorn is an extensible, open source, no-code database app…5.1
• CVE-2026-4226A weakness has been identified in LB-LINK BL-WR9000 2.4.9. T…9.8
• CVE-2026-42260Open-WebSearch is a multi-engine MCP server, CLI, and local …8.2
• CVE-2026-42261PromptHub is an all-in-one AI toolbox for prompt, skill, and…7.1
• CVE-2026-42264Axios is a promise based HTTP client for the browser and Nod…9.1
• CVE-2026-42266JupyterLab is an extensible environment for interactive and …8.8
• CVE-2026-42268ModSecurity is an open source, cross platform web applicatio…7.5
• CVE-2026-4227A security vulnerability has been detected in LB-LINK BL-WR9…7.5
• CVE-2026-42271LiteLLM is a proxy server (AI Gateway) to call LLM APIs in O…8.8
• CVE-2026-42272Heimdall is a cloud native Identity Aware Proxy and Access C…7.8
• CVE-2026-42273Heimdall is a cloud native Identity Aware Proxy and Access C…7.8
• CVE-2026-42274Heimdall is a cloud native Identity Aware Proxy and Access C…7.8