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

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), com.vaadin:vaadin (Maven). 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
    # 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
    # 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

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