Vaadin Flow up to 14.14.0/23.6.6/24.9.7/25.0.1 Endpoint /vaadin access control

Summaryinfo

A vulnerability marked as critical has been reported in Vaadin Flow up to 14.14.0/23.6.6/24.9.7/25.0.1. Affected by this issue is some unknown functionality of the file /vaadin of the component Endpoint. The manipulation leads to access control. This vulnerability is referenced as CVE-2026-2742. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Vaadin Flow up to 14.14.0/23.6.6/24.9.7/25.0.1. It has been rated as critical. This issue affects an unknown code of the file /vaadin of the component Endpoint. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at vaadin.com. The identification of this vulnerability is CVE-2026-2742 since 02/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• Vaadin

Name

• Flow

Version

• 14.0
• 14.1
• 14.2
• 14.3
• 14.4
• 14.5
• 14.6
• 14.7
• 14.8
• 14.9
• 14.10
• 14.11
• 14.12
• 14.13
• 14.14.0
• 23.6.0
• 23.6.1
• 23.6.2
• 23.6.3
• 23.6.4
• 23.6.5
• 23.6.6
• 24.9.0
• 24.9.1
• 24.9.2
• 24.9.3
• 24.9.4
• 24.9.5
• 24.9.6
• 24.9.7
• 25.0.0
• 25.0.1

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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