{"api_version":"1","generated_at":"2026-11-11T01:10:22+00:00","cve":"CVE-2026-120326","urls":{"html":"https://cve.report/CVE-2026-120326","api":"https://cve.report/api/cve/CVE-2026-120326.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-120326","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-120326"},"summary":{"title":"Unescaped Download File Name Allows Content-Disposition Parameter Injection in Vaadin Flow","description":"DownloadEvent.setFileName(String) in Vaadin Flow writes the download file name into the Content-Disposition header without escaping it. When the name is pure US-ASCII the header is built as attachment; filename=\"<name>\" with the name inserted verbatim, so a double quote in the name ends the quoted string early and the rest of the name is read by the browser as further header parameters. The inline(String) variant, present from Vaadin 25.0, builds the name the same way. An application that passes an untrusted file name to either method, for example when re-serving a file under the name it was uploaded with, lets an attacker add a filename* parameter. Browsers prefer filename* over filename, so the file is saved under a name and extension of the attacker's choosing, which defeats any file name or extension restriction the application enforces. The attacker cannot change the attachment or inline disposition itself and cannot split the header.\n\nUsers of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:\n\nProduct version\nVaadin 24.8.0 - 24.8.17\nVaadin 24.9.0 - 24.9.25\nVaadin 24.10.0 - 24.10.13\nVaadin 25.0.0 - 25.0.13\nVaadin 25.1.0 - 25.1.13\nVaadin 25.2.0 - 25.2.12\nVaadin 25.3.0 - 25.3.4\n\nMitigation\nNo fixed release on this line, upgrade to 24.9.26 or newer\nUpgrade to 24.9.26\nUpgrade to 24.10.14\nNo fixed release on this line, upgrade to 25.2.13 or newer\nNo fixed release on this line, upgrade to 25.2.13 or newer\nUpgrade to 25.2.13\nUpgrade to 25.3.5\n\nVaadin versions below 24.8 are not affected: the DownloadEvent API does not exist in them.","state":"PUBLISHED","assigner":"Vaadin","published_at":"2026-11-10 12:17:16","updated_at":"2026-11-10 12:17:16"},"problem_types":["CWE-116","CWE-116 CWE-116 Improper Encoding or Escaping of Output"],"metrics":[{"version":"4.0","source":"security@vaadin.com","type":"Secondary","score":"4.8","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","data":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":4.8,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}},{"version":"4.0","source":"CNA","type":"CVSS","score":"4.8","severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","data":{"Automatable":"NO","Recovery":"AUTOMATIC","Safety":"NEGLIGIBLE","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","providerUrgency":"CLEAR","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"LOW"}}],"references":[{"url":"https://github.com/vaadin/flow/pull/26704","name":"https://github.com/vaadin/flow/pull/26704","refsource":"security@vaadin.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://vaadin.com/security/cve-2026-120326","name":"https://vaadin.com/security/cve-2026-120326","refsource":"security@vaadin.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-120326","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120326","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 24.8.0 24.8.17 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 24.9.0 24.9.26 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 24.10.0 24.10.14 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 25.0.0 25.0.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 25.1.0 25.1.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 25.2.0 25.2.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin","version":"affected 25.3.0 25.3.5 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 24.8.0 24.8.17 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 24.9.0 24.9.26 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 24.10.0 24.10.14 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 25.0.0 25.0.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 25.1.0 25.1.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 25.2.0 25.2.13 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"vaadin-core","version":"affected 25.3.0 25.3.5 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 24.8.0 24.8.16 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 24.9.0 24.9.31 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 24.10.0 24.10.17 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 25.0.0 25.0.15 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 25.1.0 25.1.19 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 25.2.0 25.2.16 maven","platforms":[]},{"source":"CNA","vendor":"vaadin","product":"flow","version":"affected 25.3.0 25.3.6 maven","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Users of affected versions should apply the following mitigation or upgrade.","time":"","lang":"en"}],"workarounds":[{"source":"CNA","title":"","value":"Escape or reject double quotes, backslashes and control characters in any file name that does not come from the application itself before passing it to DownloadEvent.setFileName or DownloadEvent.inline.","time":"","lang":"en"}],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://repo.maven.apache.org/maven2","defaultStatus":"unaffected","packageName":"com.vaadin:vaadin","product":"vaadin","repo":"https://github.com/vaadin/platform","vendor":"vaadin","versions":[{"lessThanOrEqual":"24.8.17","status":"affected","version":"24.8.0","versionType":"maven"},{"lessThan":"24.9.26","status":"affected","version":"24.9.0","versionType":"maven"},{"lessThan":"24.10.14","status":"affected","version":"24.10.0","versionType":"maven"},{"lessThanOrEqual":"25.0.13","status":"affected","version":"25.0.0","versionType":"maven"},{"lessThanOrEqual":"25.1.13","status":"affected","version":"25.1.0","versionType":"maven"},{"lessThan":"25.2.13","status":"affected","version":"25.2.0","versionType":"maven"},{"lessThan":"25.3.5","status":"affected","version":"25.3.0","versionType":"maven"}]},{"collectionURL":"https://repo.maven.apache.org/maven2","defaultStatus":"unaffected","packageName":"com.vaadin:vaadin-core","product":"vaadin-core","repo":"https://github.com/vaadin/platform","vendor":"vaadin","versions":[{"lessThanOrEqual":"24.8.17","status":"affected","version":"24.8.0","versionType":"maven"},{"lessThan":"24.9.26","status":"affected","version":"24.9.0","versionType":"maven"},{"lessThan":"24.10.14","status":"affected","version":"24.10.0","versionType":"maven"},{"lessThanOrEqual":"25.0.13","status":"affected","version":"25.0.0","versionType":"maven"},{"lessThanOrEqual":"25.1.13","status":"affected","version":"25.1.0","versionType":"maven"},{"lessThan":"25.2.13","status":"affected","version":"25.2.0","versionType":"maven"},{"lessThan":"25.3.5","status":"affected","version":"25.3.0","versionType":"maven"}]},{"collectionURL":"https://repo.maven.apache.org/maven2","defaultStatus":"unaffected","packageName":"com.vaadin:flow-server","product":"flow","repo":"https://github.com/vaadin/flow","vendor":"vaadin","versions":[{"lessThanOrEqual":"24.8.16","status":"affected","version":"24.8.0","versionType":"maven"},{"lessThan":"24.9.31","status":"affected","version":"24.9.0","versionType":"maven"},{"lessThan":"24.10.17","status":"affected","version":"24.10.0","versionType":"maven"},{"lessThanOrEqual":"25.0.15","status":"affected","version":"25.0.0","versionType":"maven"},{"lessThanOrEqual":"25.1.19","status":"affected","version":"25.1.0","versionType":"maven"},{"lessThan":"25.2.16","status":"affected","version":"25.2.0","versionType":"maven"},{"lessThan":"25.3.6","status":"affected","version":"25.3.0","versionType":"maven"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgba(232, 232, 232, 0.04);\"><span style=\"font-family: 'Andale Mono', AndaleMono, 'Lucida Console', monospace;\">DownloadEvent.setFileName(String)</span> in Vaadin Flow writes the download file name into the <span style=\"font-family: 'Andale Mono', AndaleMono, 'Lucida Console', monospace;\">Content-Disposition</span> header without escaping it. A double quote in the name ends the quoted string early and the rest of the name is read by the browser as further header parameters, so an application that passes an untrusted file name to it, or to <span style=\"font-family: 'Andale Mono', AndaleMono, 'Lucida Console', monospace;\">inline(String)</span>, lets an attacker add a <span style=\"font-family: 'Andale Mono', AndaleMono, 'Lucida Console', monospace;\">filename*</span> parameter and have the file saved under a name and extension of their choosing.<br><br>Vaadin versions below 24.8 are not affected: the <span style=\"font-family: 'Andale Mono', AndaleMono, 'Lucida Console', monospace;\">DownloadEvent</span> API does not exist in them.</span>"}],"value":"DownloadEvent.setFileName(String) in Vaadin Flow writes the download file name into the Content-Disposition header without escaping it. When the name is pure US-ASCII the header is built as attachment; filename=\"<name>\" with the name inserted verbatim, so a double quote in the name ends the quoted string early and the rest of the name is read by the browser as further header parameters. The inline(String) variant, present from Vaadin 25.0, builds the name the same way. An application that passes an untrusted file name to either method, for example when re-serving a file under the name it was uploaded with, lets an attacker add a filename* parameter. Browsers prefer filename* over filename, so the file is saved under a name and extension of the attacker's choosing, which defeats any file name or extension restriction the application enforces. The attacker cannot change the attachment or inline disposition itself and cannot split the header.\n\nUsers of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:\n\nProduct version\nVaadin 24.8.0 - 24.8.17\nVaadin 24.9.0 - 24.9.25\nVaadin 24.10.0 - 24.10.13\nVaadin 25.0.0 - 25.0.13\nVaadin 25.1.0 - 25.1.13\nVaadin 25.2.0 - 25.2.12\nVaadin 25.3.0 - 25.3.4\n\nMitigation\nNo fixed release on this line, upgrade to 24.9.26 or newer\nUpgrade to 24.9.26\nUpgrade to 24.10.14\nNo fixed release on this line, upgrade to 25.2.13 or newer\nNo fixed release on this line, upgrade to 25.2.13 or newer\nUpgrade to 25.2.13\nUpgrade to 25.3.5\n\nVaadin versions below 24.8 are not affected: the DownloadEvent API does not exist in them."}],"impacts":[{"capecId":"CAPEC-554","descriptions":[{"lang":"en","value":"CAPEC-554 Functionality Bypass"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NO","Recovery":"AUTOMATIC","Safety":"NEGLIGIBLE","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","providerUrgency":"CLEAR","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"LOW"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-116","description":"CWE-116 Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-10T11:49:52.046Z","orgId":"9e0f3122-90e9-42d5-93de-8c6b98deef7e","shortName":"Vaadin"},"references":[{"url":"https://vaadin.com/security/cve-2026-120326"},{"url":"https://github.com/vaadin/flow/pull/26704"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<b><span style=\"background-color: transparent;\">Users of affected versions should apply the following mitigation or upgrade.</span></b><br>"}],"value":"Users of affected versions should apply the following mitigation or upgrade."}],"source":{"discovery":"INTERNAL"},"title":"Unescaped Download File Name Allows Content-Disposition Parameter Injection in Vaadin Flow","workarounds":[{"lang":"en","value":"Escape or reject double quotes, backslashes and control characters in any file name that does not come from the application itself before passing it to DownloadEvent.setFileName or DownloadEvent.inline."}],"x_generator":{"engine":"Vulnogram 0.5.0"}}},"cveMetadata":{"assignerOrgId":"9e0f3122-90e9-42d5-93de-8c6b98deef7e","assignerShortName":"Vaadin","cveId":"CVE-2026-120326","datePublished":"2026-11-10T11:49:52.046Z","dateReserved":"2026-11-01T13:24:59.528Z","dateUpdated":"2026-11-10T11:49:52.046Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-10 12:17:16","lastModifiedDate":"2026-11-10 12:17:16","problem_types":["CWE-116","CWE-116 CWE-116 Improper Encoding or Escaping of Output"],"metrics":{"cvssMetricV40":[{"source":"security@vaadin.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":4.8,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"120326","Ordinal":"1","Title":"Unescaped Download File Name Allows Content-Disposition Paramete","CVE":"CVE-2026-120326","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"120326","Ordinal":"1","NoteData":"DownloadEvent.setFileName(String) in Vaadin Flow writes the download file name into the Content-Disposition header without escaping it. When the name is pure US-ASCII the header is built as attachment; filename=\"<name>\" with the name inserted verbatim, so a double quote in the name ends the quoted string early and the rest of the name is read by the browser as further header parameters. The inline(String) variant, present from Vaadin 25.0, builds the name the same way. An application that passes an untrusted file name to either method, for example when re-serving a file under the name it was uploaded with, lets an attacker add a filename* parameter. Browsers prefer filename* over filename, so the file is saved under a name and extension of the attacker's choosing, which defeats any file name or extension restriction the application enforces. The attacker cannot change the attachment or inline disposition itself and cannot split the header.\n\nUsers of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:\n\nProduct version\nVaadin 24.8.0 - 24.8.17\nVaadin 24.9.0 - 24.9.25\nVaadin 24.10.0 - 24.10.13\nVaadin 25.0.0 - 25.0.13\nVaadin 25.1.0 - 25.1.13\nVaadin 25.2.0 - 25.2.12\nVaadin 25.3.0 - 25.3.4\n\nMitigation\nNo fixed release on this line, upgrade to 24.9.26 or newer\nUpgrade to 24.9.26\nUpgrade to 24.10.14\nNo fixed release on this line, upgrade to 25.2.13 or newer\nNo fixed release on this line, upgrade to 25.2.13 or newer\nUpgrade to 25.2.13\nUpgrade to 25.3.5\n\nVaadin versions below 24.8 are not affected: the DownloadEvent API does not exist in them.","Type":"Description","Title":"Unescaped Download File Name Allows Content-Disposition Paramete"}]}}}