CVE-2026-110737 - Vulnerability Details

- Push Endpoint Returns Permissive CORS Headers

Description

The push endpoint of a Vaadin application that uses server push reflects the request Origin into the Access-Control-Allow-Origin response header and allows credentials, because Flow configures Atmosphere with DROP_ACCESS_CONTROL_ALLOW_ORIGIN_HEADER set to false and its CorsInterceptor then echoes whatever Origin the request carries. A page on any origin can therefore make a cross origin request to that endpoint with the user's cookies and read the response, although reading anything useful also requires the push identifier of that session. Applications that do not use @Push are not affected, and neither is the WebSocket transport. The behaviour was introduced in January 2015 and is present in every Flow release and in Vaadin Framework from 7.1.0, which is when push was added.

Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:

Product version
Vaadin 14.14.0 - 14.14.7
Vaadin 23.6.0 - 23.6.16
Vaadin 24.4.0 - 24.4.25
Vaadin 24.5.0 - 24.5.15
Vaadin 24.6.0 - 24.6.13
Vaadin 24.7.0 - 24.7.16
Vaadin 24.8.0 - 24.8.17
Vaadin 24.9.0 - 24.9.23
Vaadin 24.10.0 - 24.10.11
Vaadin 25.0.0 - 25.0.13
Vaadin 25.1.0 - 25.1.13
Vaadin 25.2.0 - 25.2.10
Vaadin 25.3.0 - 25.3.2
Vaadin Framework 7.1.0 - 7.7.54
Vaadin Framework 8.0.0 - 8.32.1

Mitigation
Upgrade to 14.14.8
Upgrade to 23.6.17
Upgrade to 24.4.26
Upgrade to 24.7.17
Upgrade to 24.7.17
Upgrade to 24.7.17
Upgrade to 24.9.24
Upgrade to 24.9.24
Upgrade to 24.10.12
Upgrade to 25.2.11
Upgrade to 25.2.11
Upgrade to 25.2.11
Upgrade to 25.3.3
Upgrade to 7.7.55
Upgrade to 8.32.2

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.

Artifacts
Maven coordinates / Vulnerable versions / Fixed version
com.vaadin:vaadin / 14.14.0 - 14.14.7 / >=14.14.8
com.vaadin:vaadin / 23.6.0 - 23.6.16 / >=23.6.17
com.vaadin:vaadin / 24.4.0 - 24.4.25 / >=24.4.26
com.vaadin:vaadin / 24.5.0 - 24.5.15 / >=24.7.17
com.vaadin:vaadin / 24.6.0 - 24.6.13 / >=24.7.17
com.vaadin:vaadin / 24.7.0 - 24.7.16 / >=24.7.17
com.vaadin:vaadin / 24.8.0 - 24.8.17 / >=24.9.24
com.vaadin:vaadin / 24.9.0 - 24.9.23 / >=24.9.24
com.vaadin:vaadin / 24.10.0 - 24.10.11 / >=24.10.12
com.vaadin:vaadin / 25.0.0 - 25.0.13 / >=25.2.11
com.vaadin:vaadin / 25.1.0 - 25.1.13 / >=25.2.11
com.vaadin:vaadin / 25.2.0 - 25.2.10 / >=25.2.11
com.vaadin:vaadin / 25.3.0 - 25.3.2 / >=25.3.3
com.vaadin:vaadin-core / 14.14.0 - 14.14.7 / >=14.14.8
com.vaadin:vaadin-core / 23.6.0 - 23.6.16 / >=23.6.17
com.vaadin:vaadin-core / 24.4.0 - 24.4.25 / >=24.4.26
com.vaadin:vaadin-core / 24.5.0 - 24.5.15 / >=24.7.17
com.vaadin:vaadin-core / 24.6.0 - 24.6.13 / >=24.7.17
com.vaadin:vaadin-core / 24.7.0 - 24.7.16 / >=24.7.17
com.vaadin:vaadin-core / 24.8.0 - 24.8.17 / >=24.9.24
com.vaadin:vaadin-core / 24.9.0 - 24.9.23 / >=24.9.24
com.vaadin:vaadin-core / 24.10.0 - 24.10.11 / >=24.10.12
com.vaadin:vaadin-core / 25.0.0 - 25.0.13 / >=25.2.11
com.vaadin:vaadin-core / 25.1.0 - 25.1.13 / >=25.2.11
com.vaadin:vaadin-core / 25.2.0 - 25.2.10 / >=25.2.11
com.vaadin:vaadin-core / 25.3.0 - 25.3.2 / >=25.3.3
com.vaadin:flow-server / 2.13.0 - 2.13.7 / >=2.13.8
com.vaadin:flow-server / 23.6.0 - 23.6.15 / >=23.6.16
com.vaadin:flow-server / 24.4.0 - 24.4.18 / >=24.4.19
com.vaadin:flow-server / 24.5.0 - 24.5.17 / >=24.7.17
com.vaadin:flow-server / 24.6.0 - 24.6.14 / >=24.7.17
com.vaadin:flow-server / 24.7.0 - 24.7.15 / >=24.7.16
com.vaadin:flow-server / 24.8.0 - 24.8.16 / >=24.9.24
com.vaadin:flow-server / 24.9.0 - 24.9.28 / >=24.9.29
com.vaadin:flow-server / 24.10.0 - 24.10.14 / >=24.10.15
com.vaadin:flow-server / 25.0.0 - 25.0.15 / >=25.2.11
com.vaadin:flow-server / 25.1.0 - 25.1.18 / >=25.1.19
com.vaadin:flow-server / 25.2.0 - 25.2.12 / >=25.2.13
com.vaadin:flow-server / 25.3.0 - 25.3.3 / >=25.3.4
com.vaadin:vaadin-server / 7.1.0 - 7.7.54 / >=7.7.55
com.vaadin:vaadin-server / 8.0.0 - 8.32.1 / >=8.32.2
com.vaadin:vaadin-server-mpr-jakarta / 7.7.36 - 7.7.54 / >=7.7.55
com.vaadin:vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2

Published: 2026-10-27

Score: 2.3 Low

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

No analysis available yet.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

vaadin

unaffected

Version	Status	Constraints
`14.14.0`	affected	< 14.14.8
`23.6.0`	affected	< 23.6.17
`24.4.0`	affected	< 24.4.26
`24.5.0`	affected	≤ 24.5.15
`24.6.0`	affected	≤ 24.6.13
`24.7.0`	affected	< 24.7.17
`24.8.0`	affected	≤ 24.8.17
`24.9.0`	affected	< 24.9.24
`24.10.0`	affected	< 24.10.12
`25.0.0`	affected	≤ 25.0.13
`25.1.0`	affected	≤ 25.1.13
`25.2.0`	affected	< 25.2.11
`25.3.0`	affected	< 25.3.3

vaadin

unaffected

Version	Status	Constraints
`14.14.0`	affected	< 14.14.8
`23.6.0`	affected	< 23.6.17
`24.4.0`	affected	< 24.4.26
`24.5.0`	affected	≤ 24.5.15
`24.6.0`	affected	≤ 24.6.13
`24.7.0`	affected	< 24.7.17
`24.8.0`	affected	≤ 24.8.17
`24.9.0`	affected	< 24.9.24
`24.10.0`	affected	< 24.10.12
`25.0.0`	affected	≤ 25.0.13
`25.1.0`	affected	≤ 25.1.13
`25.2.0`	affected	< 25.2.11
`25.3.0`	affected	< 25.3.3

vaadin

flow

unaffected

Version	Status	Constraints
`2.13.0`	affected	< 2.13.8
`23.6.0`	affected	< 23.6.16
`24.4.0`	affected	< 24.4.19
`24.5.0`	affected	≤ 24.5.17
`24.6.0`	affected	≤ 24.6.14
`24.7.0`	affected	< 24.7.16
`24.8.0`	affected	≤ 24.8.16
`24.9.0`	affected	< 24.9.29
`24.10.0`	affected	< 24.10.15
`25.0.0`	affected	≤ 25.0.15
`25.1.0`	affected	< 25.1.19
`25.2.0`	affected	< 25.2.13
`25.3.0`	affected	< 25.3.4

vaadin

framework

unaffected

Version	Status	Constraints
`7.1.0`	affected	< 7.7.55
`8.0.0`	affected	< 8.32.2

vaadin

framework

unaffected

Version	Status	Constraints
`7.7.36`	affected	< 7.7.55
`8.18.0`	affected	< 8.32.2

No data.

No data available yet.

Remediation

Vendor Solution

Users of affected versions should apply the following mitigation or upgrade.

Vendor Workaround

Set the servlet init parameter org.atmosphere.cpr.dropAccessControlAllowOriginHeader to true on the Vaadin servlet, which stops the header being emitted without upgrading. In a Spring Boot application the Vaadin servlet has to be registered explicitly for the parameter to be applied.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/vaadin/flow/issues/26214
https://github.com/vaadin/flow/pull/26215
https://vaadin.com/security/cve-2026-110737

History

Tue, 27 Oct 2026 10:45:00 +0000

Type	Values Removed	Values Added
Description		The push endpoint of a Vaadin application that uses server push reflects the request Origin into the Access-Control-Allow-Origin response header and allows credentials, because Flow configures Atmosphere with DROP_ACCESS_CONTROL_ALLOW_ORIGIN_HEADER set to false and its CorsInterceptor then echoes whatever Origin the request carries. A page on any origin can therefore make a cross origin request to that endpoint with the user's cookies and read the response, although reading anything useful also requires the push identifier of that session. Applications that do not use @Push are not affected, and neither is the WebSocket transport. The behaviour was introduced in January 2015 and is present in every Flow release and in Vaadin Framework from 7.1.0, which is when push was added. Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include: Product version Vaadin 14.14.0 - 14.14.7 Vaadin 23.6.0 - 23.6.16 Vaadin 24.4.0 - 24.4.25 Vaadin 24.5.0 - 24.5.15 Vaadin 24.6.0 - 24.6.13 Vaadin 24.7.0 - 24.7.16 Vaadin 24.8.0 - 24.8.17 Vaadin 24.9.0 - 24.9.23 Vaadin 24.10.0 - 24.10.11 Vaadin 25.0.0 - 25.0.13 Vaadin 25.1.0 - 25.1.13 Vaadin 25.2.0 - 25.2.10 Vaadin 25.3.0 - 25.3.2 Vaadin Framework 7.1.0 - 7.7.54 Vaadin Framework 8.0.0 - 8.32.1 Mitigation Upgrade to 14.14.8 Upgrade to 23.6.17 Upgrade to 24.4.26 Upgrade to 24.7.17 Upgrade to 24.7.17 Upgrade to 24.7.17 Upgrade to 24.9.24 Upgrade to 24.9.24 Upgrade to 24.10.12 Upgrade to 25.2.11 Upgrade to 25.2.11 Upgrade to 25.2.11 Upgrade to 25.3.3 Upgrade to 7.7.55 Upgrade to 8.32.2 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. Artifacts Maven coordinates / Vulnerable versions / Fixed version com.vaadin:vaadin / 14.14.0 - 14.14.7 / >=14.14.8 com.vaadin:vaadin / 23.6.0 - 23.6.16 / >=23.6.17 com.vaadin:vaadin / 24.4.0 - 24.4.25 / >=24.4.26 com.vaadin:vaadin / 24.5.0 - 24.5.15 / >=24.7.17 com.vaadin:vaadin / 24.6.0 - 24.6.13 / >=24.7.17 com.vaadin:vaadin / 24.7.0 - 24.7.16 / >=24.7.17 com.vaadin:vaadin / 24.8.0 - 24.8.17 / >=24.9.24 com.vaadin:vaadin / 24.9.0 - 24.9.23 / >=24.9.24 com.vaadin:vaadin / 24.10.0 - 24.10.11 / >=24.10.12 com.vaadin:vaadin / 25.0.0 - 25.0.13 / >=25.2.11 com.vaadin:vaadin / 25.1.0 - 25.1.13 / >=25.2.11 com.vaadin:vaadin / 25.2.0 - 25.2.10 / >=25.2.11 com.vaadin:vaadin / 25.3.0 - 25.3.2 / >=25.3.3 com.vaadin:vaadin-core / 14.14.0 - 14.14.7 / >=14.14.8 com.vaadin:vaadin-core / 23.6.0 - 23.6.16 / >=23.6.17 com.vaadin:vaadin-core / 24.4.0 - 24.4.25 / >=24.4.26 com.vaadin:vaadin-core / 24.5.0 - 24.5.15 / >=24.7.17 com.vaadin:vaadin-core / 24.6.0 - 24.6.13 / >=24.7.17 com.vaadin:vaadin-core / 24.7.0 - 24.7.16 / >=24.7.17 com.vaadin:vaadin-core / 24.8.0 - 24.8.17 / >=24.9.24 com.vaadin:vaadin-core / 24.9.0 - 24.9.23 / >=24.9.24 com.vaadin:vaadin-core / 24.10.0 - 24.10.11 / >=24.10.12 com.vaadin:vaadin-core / 25.0.0 - 25.0.13 / >=25.2.11 com.vaadin:vaadin-core / 25.1.0 - 25.1.13 / >=25.2.11 com.vaadin:vaadin-core / 25.2.0 - 25.2.10 / >=25.2.11 com.vaadin:vaadin-core / 25.3.0 - 25.3.2 / >=25.3.3 com.vaadin:flow-server / 2.13.0 - 2.13.7 / >=2.13.8 com.vaadin:flow-server / 23.6.0 - 23.6.15 / >=23.6.16 com.vaadin:flow-server / 24.4.0 - 24.4.18 / >=24.4.19 com.vaadin:flow-server / 24.5.0 - 24.5.17 / >=24.7.17 com.vaadin:flow-server / 24.6.0 - 24.6.14 / >=24.7.17 com.vaadin:flow-server / 24.7.0 - 24.7.15 / >=24.7.16 com.vaadin:flow-server / 24.8.0 - 24.8.16 / >=24.9.24 com.vaadin:flow-server / 24.9.0 - 24.9.28 / >=24.9.29 com.vaadin:flow-server / 24.10.0 - 24.10.14 / >=24.10.15 com.vaadin:flow-server / 25.0.0 - 25.0.15 / >=25.2.11 com.vaadin:flow-server / 25.1.0 - 25.1.18 / >=25.1.19 com.vaadin:flow-server / 25.2.0 - 25.2.12 / >=25.2.13 com.vaadin:flow-server / 25.3.0 - 25.3.3 / >=25.3.4 com.vaadin:vaadin-server / 7.1.0 - 7.7.54 / >=7.7.55 com.vaadin:vaadin-server / 8.0.0 - 8.32.1 / >=8.32.2 com.vaadin:vaadin-server-mpr-jakarta / 7.7.36 - 7.7.54 / >=7.7.55 com.vaadin:vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2
Title		Push Endpoint Returns Permissive CORS Headers
Weaknesses		CWE-346 CWE-942
References		https://github.com/vaadin/flow/issues/26214 https://github.com/vaadin/flow/pull/26215 https://vaadin.com/security/cve-2026-110737
Metrics		cvssV4_0 `{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}`

Subscriptions

No data.

MITRE

Status: PUBLISHED

Assigner: Vaadin

Published: 2026-10-27T10:26:37.752Z

Updated: 2026-10-27T10:26:37.752Z

Reserved: 2026-10-14T16:07:47.846Z

Link: CVE-2026-110737

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-346
Origin Validation Error
CWE-942
Permissive Cross-domain Security Policy with Untrusted Domains

Tracking

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object