Kimai: Formula Injection via tag names in XLSX export_CVE-2026-42267

{
    "lastseen": "",
    "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.",
    "published": "2026-05-08T03:28:52.226Z",
    "modified": "2026-05-08T03:28:52.226Z",
    "type": "cve",
    "title": "Kimai: Formula Injection via tag names in XLSX export",
    "source": "GitHub_M",
    "references": "https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r\nhttps://github.com/kimai/kimai/releases/tag/2.54.0",
    "id": "CVE-2026-42267",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1236"
    ],
    "cvelist": null,
    "sourceData": "kimai kimai >= 2.27.0, < 2.54.0",
    "sourceHref": "",
    "cvss": {
        "score": 5.4,
        "severity": "MEDIUM",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "kimai",
    "version": ">= 2.27.0, < 2.54.0",
    "vendor": "kimai",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}