{"id":"CVE-2026-42267","aliases":["GHSA-3xc2-h5r3-wv3r"],"url":"https://o3.security/vulnerability/CVE-2026-42267","summary":"Kimai: Formula Injection via tag names in XLSX export","details":"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":"2026-08-12T03:51:28.340153243Z","cvss":null,"epss":{"score":0.0022,"percentile":0.12475,"asOf":"2026-09-11"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"kimai/kimai","fixedVersion":"2.54.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/kimai/kimai/releases/tag/2.54.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42267.json"},{"type":"ADVISORY","url":"https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42267"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.340153243Z"}}