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Advisory record · GHSA-rjgh-wgc7-m37j

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

CVSS 5.3 MediumEPSS 0.0044 · 39th percentile

Published by the GitHub Advisory Database at 10 Mar 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.vaadin:flow-serverMaven<14.14.1 || >=23.0.0, <23.6.7 || >=24.0.0, <24.9.8 || >=25.0.0, <25.0.214.14.1, 23.6.7, 24.9.8, 25.0.2
com.vaadin:vaadinMaven>=25.0.0, <25.0.2 || >=24.0.0, <24.9.8 || >=23.0.0, <23.6.7 || <14.14.125.0.2, 24.9.8, 23.6.7, 14.14.1
Identifiers
GHSA-rjgh-wgc7-m37j · CVE-2026-2742
Weakness (CWE)
CWE-284
Tags
Published
10 Mar 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vaadin (com.vaadin:flow-server and com.vaadin:vaadin) versions 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 are affected when used with Spring Security. Requesting the /VAADIN endpoint without a trailing slash bypasses security filters, so an unauthenticated user can trigger framework initialization and create sessions. Upgrade to 14.14.1, 23.6.7, 24.9.8, 25.0.2 or newer, depending on your release line; versions 10-13 and 15-22 are no longer supported.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/S:N/AU:Y/R:A/V:D/RE:L/U:Amber CNA (Vaadin)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 39th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.