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CVE-2026-42267— Kimai: Formula Injection via tag names in XLSX export

Quick assessment

Affected
kimai kimai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

kimai是kimai个人开发者的一个基于网络的多用户时间跟踪应用程序。 kimai 2.27.0版本至2.54.0之前版本存在安全漏洞，该漏洞源于任何ROLE_USER可通过POST /api/tags创建带有公式字符串作为名称的标签并分配给时间表，当管理员将时间表导出为XLSX时，ArrayFormatter.formatValue()使用implode()连接标签名称并返回未更改结果，OpenSpout将任何以=为前缀的字符串提升为FormulaCell，Excel在打开文件时评估公式。

AI Predicted 8.6 Difficulty: Trivial EPSS 0.33% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
kimai kimai >= 2.27.0, < 2.54.0 affected
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I. Basic Information for CVE-2026-42267

Vulnerability Information
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Vulnerability Title
Kimai: Formula Injection via tag names in XLSX export
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1236
Source: CVE Program / CVE List V5
Vulnerability Title
kimai 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kimai是kimai个人开发者的一个基于网络的多用户时间跟踪应用程序。 kimai 2.27.0版本至2.54.0之前版本存在安全漏洞，该漏洞源于任何ROLE_USER可通过POST /api/tags创建带有公式字符串作为名称的标签并分配给时间表，当管理员将时间表导出为XLSX时，ArrayFormatter.formatValue()使用implode()连接标签名称并返回未更改结果，OpenSpout将任何以=为前缀的字符串提升为FormulaCell，Excel在打开文件时评估公式。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kimai kimai >= 2.27.0, < 2.54.0 -

II. Public POCs for CVE-2026-42267

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III. Intelligence Information for CVE-2026-42267

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Vendor Advisories for CVE-2026-42267 (1)

Vendor Pages for CVE-2026-42267 (1)

Same Patch Batch · kimai · 2026-05-08 · 3 CVEs total

CVE-2026-44298 4.1 MEDIUM Kimai: Arbitrary file read in invoice PDF renderer (admin)
CVE-2026-41498 3.3 LOW Kimai: Team API Missing Object-Level Authorization

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-1236

V. Comments for CVE-2026-42267

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