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

Quick assessment

Affected
vaadin vaadin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vaadin是Vaadin开源的一个用于Web应用程序开发的开源平台。Vaadin 平台包括一组Web 组件、一个 Java Web 框架以及一组工具和应用程序启动器。 Vaadin 14.14.0及之前版本、23.6.6及之前版本、24.9.7及之前版本和25.0.1及之前版本存在安全漏洞，该漏洞源于保留框架路径的路径模式匹配不一致，可能导致身份验证绕过。

AI Predicted 7.5 Difficulty: Easy EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2026-2742

Vulnerability Information
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Vulnerability Title
Unauthorized session creation via reserved framework path access
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
vaadin 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vaadin是Vaadin开源的一个用于Web应用程序开发的开源平台。Vaadin 平台包括一组Web 组件、一个 Java Web 框架以及一组工具和应用程序启动器。 Vaadin 14.14.0及之前版本、23.6.6及之前版本、24.9.7及之前版本和25.0.1及之前版本存在安全漏洞，该漏洞源于保留框架路径的路径模式匹配不一致，可能导致身份验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vaadin vaadin 10.0.0 ~ 14.14.0 -
vaadin flow 1.0.0 ~ 2.13.0 -

II. Public POCs for CVE-2026-2742

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III. Intelligence Information for CVE-2026-2742

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Patches & Fixes for CVE-2026-2742 (6)

IV. Related Vulnerabilities

Same product: vaadin
Same vendor: vaadin
Same weakness: CWE-284

V. Comments for CVE-2026-2742

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