{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42267","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-26T11:53:27.706Z","datePublished":"2026-05-08T03:28:52.226Z","dateUpdated":"2026-05-08T12:58:12.770Z"},"containers":{"cna":{"title":"Kimai: Formula Injection via tag names in XLSX export","problemTypes":[{"descriptions":[{"cweId":"CWE-1236","lang":"en","description":"CWE-1236: Improper Neutralization of Formula Elements in a CSV File","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","vectorString":"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"}}],"references":[{"name":"https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r"},{"name":"https://github.com/kimai/kimai/releases/tag/2.54.0","tags":["x_refsource_MISC"],"url":"https://github.com/kimai/kimai/releases/tag/2.54.0"}],"affected":[{"vendor":"kimai","product":"kimai","versions":[{"version":">= 2.27.0, < 2.54.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-05-08T03:28:52.226Z"},"descriptions":[{"lang":"en","value":"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":{"advisory":"GHSA-3xc2-h5r3-wv3r","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/kimai/kimai/security/advisories/GHSA-3xc2-h5r3-wv3r","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-08T12:57:49.978866Z","id":"CVE-2026-42267","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-08T12:58:12.770Z"}}]}}