Medium 5.3Published Mar 10, 2026

CVE-2026-2742An 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 incon…

Updated under an hour ago (2026-10-19 07:10 UTC)

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Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vaadin vaadin vaadin:vaadin	from 10.0.0 before 14.14.1; from 15.0.0 before 23.6.7; from 24.0.0 before 24.9.8; from 25.0.0 before 25.0.2	NVD

References

https://github.com/vaadin/flow/pull/22998issue-tracking, patch
https://github.com/vaadin/flow/pull/23033issue-tracking, patch
https://github.com/vaadin/flow/pull/23034issue-tracking, patch
https://github.com/vaadin/flow/pull/23037issue-tracking, patch
https://github.com/vaadin/flow/pull/23052issue-tracking, patch
https://github.com/vaadin/flow/pull/23057issue-tracking, patch
https://vaadin.com/security/cve-2026-2742vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.