CVE-2026-42267

medium

Kimai is an open-source time tracking application.

Vendor / product: Kimai — kimai

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 SUM(54+51) into the XLSX archive. Excel evaluates the formula when the file is opened. This issue has been patched in version 2.54.0.

CVSS

5.7

5.7 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Severity source: NVD CVSS v3.1 (nvd@nist.gov)

Timeline (UTC)

Published: 2026-05-08 04:16

Modified: 2026-11-11 23:10

NVD status: Analyzed

Last synced 3 hours ago

Verified against the source API 2026-11-11 23:13 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

kimai / kimai ≥2.27.0 <2.54.0

Weakness classification (CWE)

CWE-1236

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

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

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

References

https://github.com/kimai/kimai/releases/tag/2.54.0 security-advisories@github.com
https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r security-advisories@github.com
https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r 134c704f-9b21-4f2e-91b3-4a467353bcc0

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 23:13 UTC · record ↗

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