Monitor vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
7.3
Vaadin Apps Using Spring Security Can Be Hacked Without a Password
CVE-2026-2742
GHSA-rjgh-wgc7-m37j
CVE-2026-2742
Summary
Some Vaadin apps using Spring Security can be accessed without a password because of a mistake in how the app handles certain URLs. This lets unauthorized users get into the app and create their own sessions. To fix this, update your Vaadin app to the latest version of 14, 23, 24, or 25.
What to do
- Update com.vaadin:flow-server to version 14.14.1.
- Update com.vaadin:flow-server to version 23.6.7.
- Update com.vaadin:flow-server to version 24.9.8.
- Update com.vaadin:flow-server to version 25.0.2.
- Update com.vaadin:vaadin to version 25.0.2.
- Update com.vaadin:vaadin to version 24.9.8.
- Update com.vaadin:vaadin to version 23.6.7.
- Update com.vaadin:vaadin to version 14.14.1.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | com.vaadin:flow-server | <= 14.14.1 | 14.14.1 |
| – | com.vaadin:flow-server | > 23.0.0 , <= 23.6.7 | 23.6.7 |
| – | com.vaadin:flow-server | > 24.0.0 , <= 24.9.8 | 24.9.8 |
| – | com.vaadin:flow-server | > 25.0.0 , <= 25.0.2 | 25.0.2 |
| – | com.vaadin:vaadin | > 25.0.0 , <= 25.0.2 | 25.0.2 |
| – | com.vaadin:vaadin | > 24.0.0 , <= 24.9.8 | 24.9.8 |
| – | com.vaadin:vaadin | > 23.0.0 , <= 23.6.7 | 23.6.7 |
| – | com.vaadin:vaadin | <= 14.14.1 | 14.14.1 |
Original title
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 inc...
Original description
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.
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.
nvd CVSS4.0
5.3
Vulnerability type
CWE-284
Improper Access Control
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-2742
- https://github.com/advisories/GHSA-rjgh-wgc7-m37j
Published: 10 Mar 2026 · Updated: 14 Mar 2026 · First seen: 11 Mar 2026