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Java CVE-2026-2742

MEDIUM
Improper Access Control (CWE-284)
2026-03-10 security@vaadin.com GHSA-rjgh-wgc7-m37j
Authentication Bypass Java Red Hat
5.3
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
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
Red Hat
6.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
N

Lifecycle Timeline

4
CVSS changed
May 07, 2026 - 18:52 NVD
5.3 (MEDIUM)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 18:18 nvd
N/A

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 119 maven packages depend on com.vaadin:flow-server (45 direct, 74 indirect)
  • 3 maven packages depend on com.vaadin:vaadin (3 direct, 0 indirect)

Ecosystem-wide dependent count for version 23.0.0 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

Authentication bypass in Vaadin framework (14.0.0-14.14.0, 23.0.0-23.6.x, and other ranges). The web application framework fails to properly enforce authentication on certain routes.

Technical ContextAI

This vulnerability (CWE-284: Improper Access Control) affects An authentication bypass vulnerability exists in Vaadin 14.0.0. 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 Spr

RemediationAI

Update to version 14.14.1 or later.

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CVE-2026-2742 vulnerability details – vuln.today
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