CVE-2026-2742

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, applications using Spring Security due to inconsistent path pattern matching of reserved framework paths. 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. Users of affected versions using Spring Security should upgrade as follows: 14.0.0-14.14.0 upgrade to 14.14.1, 23.0.0-23.6.6 to 23.6.7, 24.0.0 - 24.9.7 to 24.9.8, and 25.0.0-25.0.1 upgrade to 25.0.2 or newer. 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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/vaadin/flow/pull/22998
https://github.com/vaadin/flow/pull/23033
https://github.com/vaadin/flow/pull/23034
https://github.com/vaadin/flow/pull/23037
https://github.com/vaadin/flow/pull/23052
https://github.com/vaadin/flow/pull/23057
https://vaadin.com/security/cve-2026-2742

Configurations

No configuration.

History

10 Mar 2026, 18:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-10 18:18

Updated : 2026-03-11 13:53

NVD link : CVE-2026-2742

Mitre link : CVE-2026-2742

CVE.ORG link : CVE-2026-2742

JSON object : View

Products Affected

No product.

CWE

CWE-284

Improper Access Control

{"id": "CVE-2026-2742", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "security@vaadin.com", "cvssData": {"Safety": "NEGLIGIBLE", "version": "4.0", "Recovery": "AUTOMATIC", "baseScore": 5.3, "Automatable": "YES", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "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/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:N/AU:Y/R:A/V:D/RE:L/U:Amber", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "AMBER", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "LOW", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-10T18:18:49.410", "references": [{"url": "https://github.com/vaadin/flow/pull/22998", "source": "security@vaadin.com"}, {"url": "https://github.com/vaadin/flow/pull/23033", "source": "security@vaadin.com"}, {"url": "https://github.com/vaadin/flow/pull/23034", "source": "security@vaadin.com"}, {"url": "https://github.com/vaadin/flow/pull/23037", "source": "security@vaadin.com"}, {"url": "https://github.com/vaadin/flow/pull/23052", "source": "security@vaadin.com"}, {"url": "https://github.com/vaadin/flow/pull/23057", "source": "security@vaadin.com"}, {"url": "https://vaadin.com/security/cve-2026-2742", "source": "security@vaadin.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security@vaadin.com", "description": [{"lang": "en", "value": "CWE-284"}]}], "descriptions": [{"lang": "en", "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."}], "lastModified": "2026-03-11T13:53:20.707", "sourceIdentifier": "security@vaadin.com"}