{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-2742", "assignerOrgId": "9e0f3122-90e9-42d5-93de-8c6b98deef7e", "state": "PUBLISHED", "assignerShortName": "Vaadin", "dateReserved": "2026-02-19T12:00:12.056Z", "datePublished": "2026-03-10T12:08:48.738Z", "dateUpdated": "2026-03-10T12:08:48.738Z"}, "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": "14.14.0", "status": "affected", "version": "14.0.0", "versionType": "maven"}, {"lessThanOrEqual": "23.6.6", "status": "affected", "version": "23.0.0", "versionType": "maven"}, {"lessThanOrEqual": "24.9.7", "status": "affected", "version": "24.0.0", "versionType": "maven"}, {"lessThanOrEqual": "25.0.1", "status": "affected", "version": "25.0.0", "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": "14.14.0", "status": "affected", "version": "14.0.0", "versionType": "maven"}, {"lessThanOrEqual": "23.6.6", "status": "affected", "version": "23.0.0", "versionType": "maven"}, {"lessThanOrEqual": "24.9.7", "status": "affected", "version": "24.0.0", "versionType": "maven"}, {"lessThanOrEqual": "25.0.1", "status": "affected", "version": "25.0.0", "versionType": "maven"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgba(232, 232, 232, 0.04);\">An authentication bypass vulnerability exists in Vaadin 14.0.0 through 14.14.0, 23.0.0 through 23.6.6, 24.0.0 through 24.9.7 and 25.0.0 through 25.0.1,&nbsp;applications using Spring Security due to inconsistent path pattern matching of reserved framework paths.<br><br>Accessing the /VAADIN endpoint without a trailing slash bypasses security filters, and allowing unauthenticated users to trigger framework initialization and create sessions without proper authorization.<br><br>Users of affected versions using Spring Security should upgrade as follows: 14.0.0-14.14.0 upgrade to 14.14.1,&nbsp;23.0.0-23.6.6 to&nbsp;23.6.7,&nbsp;24.0.0 - 24.9.7 to&nbsp;24.9.8, and&nbsp;25.0.0-25.0.1 upgrade to&nbsp;25.0.2 or newer.<br><br>Please note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 14, 23, 24, 25 version.<br><br></span>"}], "value": "An authentication bypass vulnerability exists in Vaadin 14.0.0 through 14.14.0, 23.0.0 through 23.6.6, 24.0.0 through 24.9.7 and 25.0.0 through 25.0.1,\u00a0applications using Spring Security due to inconsistent path pattern matching of reserved framework paths.\n\nAccessing the /VAADIN endpoint without a trailing slash bypasses security filters, and allowing unauthenticated users to trigger framework initialization and create sessions without proper authorization.\n\nUsers of affected versions using Spring Security should upgrade as follows: 14.0.0-14.14.0 upgrade to 14.14.1,\u00a023.0.0-23.6.6 to\u00a023.6.7,\u00a024.0.0 - 24.9.7 to\u00a024.9.8, and\u00a025.0.0-25.0.1 upgrade to\u00a025.0.2 or newer.\n\nPlease note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 14, 23, 24, 25 version."}], "impacts": [{"capecId": "CAPEC-554", "descriptions": [{"lang": "en", "value": "CAPEC-554 Functionality Bypass"}]}], "metrics": [{"cvssV4_0": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NEGLIGIBLE", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 5.3, "baseSeverity": "MEDIUM", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "AMBER", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "DIFFUSE", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/S:N/AU:Y/R:A/V:D/RE:L/U:Amber", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "LOW"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-284", "description": "CWE-284 Improper Access Control", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9e0f3122-90e9-42d5-93de-8c6b98deef7e", "shortName": "Vaadin", "dateUpdated": "2026-03-10T12:08:48.738Z"}, "references": [{"url": "https://vaadin.com/security/cve-2026-2742"}, {"url": "https://github.com/vaadin/flow/pull/22998"}, {"url": "https://github.com/vaadin/flow/pull/23037"}, {"url": "https://github.com/vaadin/flow/pull/23057"}], "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": "UNKNOWN"}, "title": "Unauthorized session creation via reserved framework path access", "x_generator": {"engine": "Vulnogram 0.5.0"}}}}

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