Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-12T07:45:21 webpack-dev-server: webpack-dev-server: Information disclosure due to cross-origin source code exposure 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N CWE-346

webpack-dev-server versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when serving over a non-potentially trustworthy origin such as plain HTTP. The previous fix relied on the Sec-Fetch-Mode and Sec-Fetch-Site request headers, which browsers omit for non-trustworthy origins, allowing a malicious site to load the bundled source as a script and read it across origins. Impact: an attacker controlling a website visited by a developer running webpack-dev-server can recover the application source code when the dev server runs over HTTP at a guessable host and port. Chromium based browsers from Chrome 142 onward are not affected due to local network access restrictions. Upgrade to webpack-dev-server 5.2.4 or later, which sets Cross-Origin-Resource-Policy: same-origin on responses.

A flaw was found in webpack-dev-server. When the development server operates over plain HTTP, a remote attacker can exploit a cross-origin source code exposure vulnerability. This allows a malicious website, visited by a developer, to load the bundled application source code as a script and read it across origins. Consequently, this could lead to the disclosure of sensitive application source code.

Cryostat 4 Fix deferred cryostat-openshift-console-plugin-npm Cryostat 4 Fix deferred webpack-dev-server Gatekeeper 3 Fix deferred gatekeeper/gatekeeper-rhel9 Migration Toolkit for Containers Fix deferred rhmtc/openshift-migration-ui-rhel8 Node HealthCheck Operator Fix deferred workload-availability/node-healthcheck-must-gather-rhel9 Node HealthCheck Operator Fix deferred workload-availability/node-healthcheck-operator-bundle Node HealthCheck Operator Fix deferred workload-availability/node-healthcheck-rhel9-operator OpenShift Lightspeed Fix deferred openshift-lightspeed/lightspeed-console-plugin-419-rhel9 OpenShift Lightspeed Fix deferred openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 OpenShift Lightspeed Fix deferred openshift-lightspeed/lightspeed-console-plugin-rhel9 OpenShift Pipelines Fix deferred openshift-pipelines/pipelines-console-plugin-rhel8 OpenShift Pipelines Fix deferred openshift-pipelines/pipelines-console-plugin-rhel9 OpenShift Pipelines Fix deferred openshift-pipelines/pipelines-hub-ui-rhel8 OpenShift Pipelines Fix deferred openshift-pipelines/pipelines-hub-ui-rhel9 OpenShift Service Mesh 2 Fix deferred openshift-service-mesh/kiali-ossmc-rhel8 OpenShift Service Mesh 2 Fix deferred openshift-service-mesh/kiali-rhel8 OpenShift Service Mesh 3 Fix deferred openshift-service-mesh/kiali-operator-bundle OpenShift Service Mesh 3 Fix deferred openshift-service-mesh/kiali-ossmc-rhel9 OpenShift Service Mesh 3 Fix deferred openshift-service-mesh/kiali-rhel9 OpenShift Service Mesh 3 Fix deferred openshift-service-mesh/kiali-rhel9-operator Red Hat AMQ Broker 7 Fix deferred webpack-dev-server Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-24/lightspeed-rhel8 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-25/lightspeed-rhel8 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-26/gateway-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred ansible-automation-platform-26/lightspeed-rhel9 Red Hat Ansible Automation Platform 2 Fix deferred automation-eda-controller Red Hat build of Apache Camel for Spring Boot 4 Fix deferred webpack-dev-server Red Hat build of Apache Camel - HawtIO 4 Fix deferred webpack-dev-server Red Hat build of Apicurio Registry 2 Fix deferred webpack-dev-server Red Hat Build of Podman Desktop Fix deferred rh-podman-desktop.git Red Hat Data Grid 8 Fix deferred webpack-dev-server Red Hat Developer Hub Fix deferred rhdh/rhdh-hub-rhel9 Red Hat Discovery 2 Fix deferred discovery/discovery-ui-rhel9 Red Hat Enterprise Linux 10 Fix deferred grafana Red Hat Enterprise Linux 10 Fix deferred js-d3-flame-graph Red Hat Enterprise Linux 10 Fix deferred pcs Red Hat Enterprise Linux 8 Fix deferred grafana Red Hat Enterprise Linux 8 Fix deferred pcs Red Hat Enterprise Linux 9 Fix deferred grafana Red Hat Enterprise Linux 9 Fix deferred js-d3-flame-graph Red Hat Enterprise Linux 9 Fix deferred pcs Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/disk-image-cuda-rhel9 Red Hat Fuse 7 Fix deferred webpack-dev-server Red Hat OpenShift AI (RHOAI) Fix deferred rhoai/odh-mlflow-rhel9 Red Hat OpenShift Container Platform 4 Fix deferred openshift4/ose-console-rhel9 Red Hat OpenShift Virtualization 4 Fix deferred container-native-virtualization/kubevirt-console-plugin Red Hat OpenShift Virtualization 4 Fix deferred container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Process Automation 7 Fix deferred webpack-dev-server Red Hat Quay 3 Fix deferred quay/quay-rhel8 Self-service automation portal 2 Fix deferred ansible-automation-platform/automation-portal https://www.cve.org/CVERecord?id=CVE-2026-6402 https://nvd.nist.gov/vuln/detail/CVE-2026-6402 https://cna.openjsf.org/security-advisories.html https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-79cf-xcqc-c78w