Unauthorized session creation via reserved framework path access
Summary
| CVE | CVE-2026-2742 |
|---|---|
| State | PUBLISHED |
| Assigner | Vaadin |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-10 18:18:49 UTC |
| Updated | 2026-05-07 18:40:35 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 5.3 MEDIUM from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:D/RE:L/U:Amber
Problem Types: CWE-284 | NVD-CWE-Other | CWE-284 CWE-284 Improper Access Control
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 5.3 | MEDIUM | 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/E:X/C... |
| 4.0 | CNA | CVSS | 5.3 | MEDIUM | 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/A... |
| 3.1 | [email protected] | Primary | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
LowUser Interaction
NoneConfidentiality
NoneIntegrity
NoneAvailability
LowSub Conf.
NoneSub Integrity
NoneSub Availability
LowCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:D/RE:L/U:Amber
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Vaadin | Vaadin | affected 10.0.0 14.14.0 maven | Not specified |
| CNA | Vaadin | Vaadin | affected 15.0.0 23.6.6 maven | Not specified |
| CNA | Vaadin | Vaadin | affected 24.0.0 24.9.7 maven | Not specified |
| CNA | Vaadin | Vaadin | affected 25.0.0 25.0.1 maven | Not specified |
| CNA | Vaadin | Flow | affected 1.0.0 2.13.0 maven | Not specified |
| CNA | Vaadin | Flow | affected 3.0.0 23.6.7 maven | Not specified |
| CNA | Vaadin | Flow | affected 24.0.0 24.9.7 maven | Not specified |
| CNA | Vaadin | Flow | affected 25.0.0 25.0.1 maven | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/vaadin/flow/pull/23037 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/vaadin/flow/pull/22998 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/vaadin/flow/pull/23052 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/vaadin/flow/pull/23034 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/vaadin/flow/pull/23033 | [email protected] | github.com | Issue Tracking, Patch |
| github.com/vaadin/flow/pull/23057 | [email protected] | github.com | Issue Tracking, Patch |
| vaadin.com/security/cve-2026-2742 | [email protected] | vaadin.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Solutions
CNA: Users of affected versions should apply the following mitigation or upgrade.
There are currently no legacy QID mappings associated with this CVE.