# CVE-2026-2742: Vaadin Vulnerable to Authentication Bypass When Accessing the /VAADIN Endpoint Without a Trailing Slash

Source: https://junglewise.ai/threats/cve-2026-2742-vaadin-vulnerable-to-authentication-bypass-when-accessing-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-10  
License: CC BY 4.0 with a link back

CVE-2026-2742 · Severity: medium · CVSS 4 · Published 2026-03-10

Vaadin Vulnerable to Authentication Bypass When Accessing the /VAADIN Endpoint Without a Trailing Slash

Technologies: [com.vaadin:flow-server (Maven)](https://junglewise.ai/threats/technologies/com-vaadin-flow-server), [com.vaadin:vaadin (Maven)](https://junglewise.ai/threats/technologies/com-vaadin-vaadin). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2026-2742 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-2742 being exploited in the wild.

**How severe is CVE-2026-2742?** Medium severity, with a CVSS score of 4, published 10 March 2026.

**Which products and versions are affected?** com.vaadin:flow-server (Maven) ECOSYSTEM:introduced=0,fixed=14.14.1; com.vaadin:vaadin (Maven) ECOSYSTEM:introduced=25.0.0,fixed=25.0.2.

**Is there a fix for CVE-2026-2742?** Yes. com.vaadin:flow-server (Maven): upgrade to 14.14.1 or later; com.vaadin:vaadin (Maven): upgrade to 25.0.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-2742?** Check whether you run com.vaadin:flow-server (Maven) or com.vaadin:vaadin (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- com.vaadin:flow-server (Maven): upgrade to 14.14.1 or later

  ```sh
  # set com.vaadin:flow-server to 14.14.1 in your pom.xml or build.gradle
  ```

- com.vaadin:vaadin (Maven): upgrade to 25.0.2 or later

  ```sh
  # set com.vaadin:vaadin to 25.0.2 in your pom.xml or build.gradle
  ```


## Affected products

- com.vaadin:flow-server (Maven) ECOSYSTEM:introduced=0,fixed=14.14.1
- com.vaadin:vaadin (Maven) ECOSYSTEM:introduced=25.0.0,fixed=25.0.2

## Identifiers

- CVE-2026-2742
- GHSA-rjgh-wgc7-m37j

## Related threats

- [Vaadin vulnerable to Cross-site Scripting](https://junglewise.ai/threats/cve-2025-15022-vaadin-vulnerable-to-cross-site-scripting)
- [Vaadin Platform possible file bypass via upload validation on the server-side](https://junglewise.ai/threats/vaadin-platform-possible-file-bypass-via-upload-validation-on-the-b78af9e4)
- [Vaadin vulnerable to possible information disclosure in non visible components.](https://junglewise.ai/threats/cve-2023-25499-vaadin-vulnerable-to-possible-information-disclosure-in-non)
- [Vaadin vulnerable to possible information disclosure of class and method names in RPC response](https://junglewise.ai/threats/cve-2023-25500-vaadin-vulnerable-to-possible-information-disclosure-of-class-and)
- [Possible information disclosure inside TreeGrid component with default data provider](https://junglewise.ai/threats/cve-2022-29567-possible-information-disclosure-inside-treegrid-component-with)