CVE-2026-2742

Unauthorized session creation via reserved framework path access

MEDIUM

5.3

CVSS Score

Published: March 10, 2026 at 12:08 PM UTC

Updated: June 17, 2026 at 10:31 AM UTC

2 products affected across 1 vendorVaadinFlow

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vaadin · Vaadinmaven

95%

10.0.0 ≤ v ≤ 14.14.010.0.0 ≤ v < 14.14.115.0.0 ≤ v ≤ 23.6.615.0.0 ≤ v < 23.6.724.0.0 ≤ v ≤ 24.9.724.0.0 ≤ v < 24.9.825.0.0 ≤ v ≤ 25.0.125.0.0 ≤ v < 25.0.210.0.0 15.0.0 24.0.0 25.0.0

Flow · Vaadinmaven

60%

1.0.0 ≤ v ≤ 2.13.024.0.0 ≤ v ≤ 24.9.725.0.0 ≤ v < 25.0.13.0.0 ≤ v ≤ 23.6.71.0.0 24.0.0 25.0.0 3.0.0

Affected range stops below 25.0.1, so it looks safe — our inference, not a vendor statement