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CVE-2026-2742

Unauthorized session creation via reserved framework path access

Published: Mar 10, 2026Updated: May 7, 2026 Sources: CVE List NVD GHSACWE-284
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 69.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-284NVD-CWE-Other

Affected Products

vaadinvaadin
LibraryLibrary
OSS Libraries / web-framework
flowvaadin
Mixed
OSS Libraries / web-framework
com.vaadin:flow-serverMavenOSS Libraries
com.vaadin:vaadinMavenOSS Libraries
vaadincommercialOSS Libraries
mavenpackage-ecosystemOSS Libraries

Exploitability

Official Patch Available

References

https://vaadin.com/security/cve-2026-2742
vaadin.com
https://github.com/vaadin/flow/pull/22998
github.com
https://github.com/vaadin/flow/pull/23037
github.com
and 6 more references View all →

Timeline

Published
Mar 10, 2026
Last Updated
May 7, 2026

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