CVE-2026-42267

Summary

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.

Affected Software

Weaknesses

• CWE-1236: CWE-1236: Improper Neutralization of Formula Elements in a CSV File

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r

References

• https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r
• https://github.com/kimai/kimai/releases/tag/2.54.0

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