Medium 5.3Published Mar 10, 2026

CVE-2026-2742Unauthorized session creation via reserved framework path access

Updated under an hour ago (Oct 27, 2026, 8:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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 (v4.0, CNA)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
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: Vaadin
NVD analysis: Analyzed
Record last updated: Mar 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vaadin vaadin vaadin:vaadin (from the name)	from 10.0.0 through 14.14.0; from 15.0.0 through 23.6.6; from 24.0.0 through 24.9.7; from 25.0.0 through 25.0.1	CNA record
vaadin flow vaadin:flow (from the name)	from 1.0.0 through 2.13.0; from 3.0.0 through 23.6.7; from 24.0.0 through 24.9.7; from 25.0.0 before 25.0.1	CNA record
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

References

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

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.