Push Endpoint Returns Permissive CORS Headers

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-110737
StatePUBLISHED
AssignerVaadin
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 11:17:27 UTC
Updated2026-10-27 16:03:45 UTC
DescriptionThe 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 under com.vaadin Maven coordinates / Vulnerable versions / Fixed version vaadin / 14.14.0 - 14.14.7 / >=14.14.8 vaadin / 23.6.0 - 23.6.16 / >=23.6.17 vaadin / 24.4.0 - 24.4.25 / >=24.4.26 vaadin / 24.5.0 - 24.5.15 / >=24.7.17 vaadin / 24.6.0 - 24.6.13 / >=24.7.17 vaadin / 24.7.0 - 24.7.16 / >=24.7.17 vaadin / 24.8.0 - 24.8.17 / >=24.9.24 vaadin / 24.9.0 - 24.9.23 / >=24.9.24 vaadin / 24.10.0 - 24.10.11 / >=24.10.12 vaadin / 25.0.0 - 25.0.13 / >=25.2.11 vaadin / 25.1.0 - 25.1.13 / >=25.2.11 vaadin / 25.2.0 - 25.2.10 / >=25.2.11 vaadin / 25.3.0 - 25.3.2 / >=25.3.3 vaadin-core / 14.14.0 - 14.14.7 / >=14.14.8 vaadin-core / 23.6.0 - 23.6.16 / >=23.6.17 vaadin-core / 24.4.0 - 24.4.25 / >=24.4.26 vaadin-core / 24.5.0 - 24.5.15 / >=24.7.17 vaadin-core / 24.6.0 - 24.6.13 / >=24.7.17 vaadin-core / 24.7.0 - 24.7.16 / >=24.7.17 vaadin-core / 24.8.0 - 24.8.17 / >=24.9.24 vaadin-core / 24.9.0 - 24.9.23 / >=24.9.24 vaadin-core / 24.10.0 - 24.10.11 / >=24.10.12 vaadin-core / 25.0.0 - 25.0.13 / >=25.2.11 vaadin-core / 25.1.0 - 25.1.13 / >=25.2.11 vaadin-core / 25.2.0 - 25.2.10 / >=25.2.11 vaadin-core / 25.3.0 - 25.3.2 / >=25.3.3 flow-server / 2.13.0 - 2.13.7 / >=2.13.8 flow-server / 23.6.0 - 23.6.15 / >=23.6.16 flow-server / 24.4.0 - 24.4.18 / >=24.4.19 flow-server / 24.5.0 - 24.5.17 / >=24.7.17 flow-server / 24.6.0 - 24.6.14 / >=24.7.17 flow-server / 24.7.0 - 24.7.15 / >=24.7.16 flow-server / 24.8.0 - 24.8.16 / >=24.9.24 flow-server / 24.9.0 - 24.9.28 / >=24.9.29 flow-server / 24.10.0 - 24.10.14 / >=24.10.15 flow-server / 25.0.0 - 25.0.15 / >=25.2.11 flow-server / 25.1.0 - 25.1.18 / >=25.1.19 flow-server / 25.2.0 - 25.2.12 / >=25.2.13 flow-server / 25.3.0 - 25.3.3 / >=25.3.4 vaadin-server / 7.1.0 - 7.7.54 / >=7.7.55 vaadin-server / 8.0.0 - 8.32.1 / >=8.32.2 vaadin-server-mpr-jakarta / 7.7.36 - 7.7.54 / >=7.7.55 vaadin-server-mpr-jakarta / 8.18.0 - 8.32.1 / >=8.32.2

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from [email protected]

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/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:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-346 | CWE-942 | CWE-942 CWE-942 Permissive Cross-domain Policy with Untrusted Domains | CWE-346 CWE-346 Origin Validation Error

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.3LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS2.3LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/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:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Vaadin Vaadin affected 14.14.0 14.14.8 maven Not specified
CNA Vaadin Vaadin affected 23.6.0 23.6.17 maven Not specified
CNA Vaadin Vaadin affected 24.4.0 24.4.26 maven Not specified
CNA Vaadin Vaadin affected 24.5.0 24.5.15 maven Not specified
CNA Vaadin Vaadin affected 24.6.0 24.6.13 maven Not specified
CNA Vaadin Vaadin affected 24.7.0 24.7.17 maven Not specified
CNA Vaadin Vaadin affected 24.8.0 24.8.17 maven Not specified
CNA Vaadin Vaadin affected 24.9.0 24.9.24 maven Not specified
CNA Vaadin Vaadin affected 24.10.0 24.10.12 maven Not specified
CNA Vaadin Vaadin affected 25.0.0 25.0.13 maven Not specified
CNA Vaadin Vaadin affected 25.1.0 25.1.13 maven Not specified
CNA Vaadin Vaadin affected 25.2.0 25.2.11 maven Not specified
CNA Vaadin Vaadin affected 25.3.0 25.3.3 maven Not specified
CNA Vaadin Vaadin affected 14.14.0 14.14.8 maven Not specified
CNA Vaadin Vaadin affected 23.6.0 23.6.17 maven Not specified
CNA Vaadin Vaadin affected 24.4.0 24.4.26 maven Not specified
CNA Vaadin Vaadin affected 24.5.0 24.5.15 maven Not specified
CNA Vaadin Vaadin affected 24.6.0 24.6.13 maven Not specified
CNA Vaadin Vaadin affected 24.7.0 24.7.17 maven Not specified
CNA Vaadin Vaadin affected 24.8.0 24.8.17 maven Not specified
CNA Vaadin Vaadin affected 24.9.0 24.9.24 maven Not specified
CNA Vaadin Vaadin affected 24.10.0 24.10.12 maven Not specified
CNA Vaadin Vaadin affected 25.0.0 25.0.13 maven Not specified
CNA Vaadin Vaadin affected 25.1.0 25.1.13 maven Not specified
CNA Vaadin Vaadin affected 25.2.0 25.2.11 maven Not specified
CNA Vaadin Vaadin affected 25.3.0 25.3.3 maven Not specified
CNA Vaadin Flow affected 2.13.0 2.13.8 maven Not specified
CNA Vaadin Flow affected 23.6.0 23.6.16 maven Not specified
CNA Vaadin Flow affected 24.4.0 24.4.19 maven Not specified
CNA Vaadin Flow affected 24.5.0 24.5.17 maven Not specified
CNA Vaadin Flow affected 24.6.0 24.6.14 maven Not specified
CNA Vaadin Flow affected 24.7.0 24.7.16 maven Not specified
CNA Vaadin Flow affected 24.8.0 24.8.16 maven Not specified
CNA Vaadin Flow affected 24.9.0 24.9.29 maven Not specified
CNA Vaadin Flow affected 24.10.0 24.10.15 maven Not specified
CNA Vaadin Flow affected 25.0.0 25.0.15 maven Not specified
CNA Vaadin Flow affected 25.1.0 25.1.19 maven Not specified
CNA Vaadin Flow affected 25.2.0 25.2.13 maven Not specified
CNA Vaadin Flow affected 25.3.0 25.3.4 maven Not specified
CNA Vaadin Framework affected 7.1.0 7.7.55 maven Not specified
CNA Vaadin Framework affected 8.0.0 8.32.2 maven Not specified
CNA Vaadin Framework affected 7.7.36 7.7.55 maven Not specified
CNA Vaadin Framework affected 8.18.0 8.32.2 maven Not specified

References

ReferenceSourceLinkTags
github.com/vaadin/flow/issues/26214 [email protected] github.com
vaadin.com/security/cve-2026-110737 [email protected] vaadin.com
github.com/vaadin/flow/pull/26215 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

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

Workarounds

CNA: 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.

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