Unauthorized session creation via reserved framework path access

Summary

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.

Timeline

1. Mar 10, 2026, 12:08 PM UTCCVE published
2. Mar 10, 2026, 1:42 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Mar 16, 2026, 10:52 AM UTCRecord last updated

Affected versions

• com.vaadin:vaadin

  From 10.0.0 · through 14.14.0; From 15.0.0 · through 23.6.6; From 24.0.0 · through 24.9.7; From 25.0.0 · through 25.0.1

• com.vaadin:flow-server

  From 1.0.0 · through 2.13.0; From 3.0.0 · through 23.6.7; From 24.0.0 · through 24.9.7; From 25.0.0 · fixed in 25.0.1

• com.vaadin:flow-serverMaven

  fixed in 14.14.1

• com.vaadin:flow-serverMaven

  From 23.0.0 · fixed in 23.6.7

• com.vaadin:flow-serverMaven

  From 24.0.0 · fixed in 24.9.8

• com.vaadin:flow-serverMaven

  From 25.0.0 · fixed in 25.0.2

• com.vaadin:vaadinMaven

  From 25.0.0 · fixed in 25.0.2

• com.vaadin:vaadinMaven

  From 24.0.0 · fixed in 24.9.8

• com.vaadin:vaadinMaven

  From 23.0.0 · fixed in 23.6.7

• com.vaadin:vaadinMaven

  fixed in 14.14.1

References 7