CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-9595

Impact: When a user-configured proxy on webpack-dev-server has a broad context (e.g. /) and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket). Patches: Fixed in webpack-dev-server@5.2.5. Workarounds: Scope user-defined proxy context to specific paths instead of /, or omit ws: true from the proxy entry when WebSocket forwarding is not required.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 9.3%

CVSS Severity

CVSS v3 Score 5.3

References

Products affected by CVE-2026-9595

Webpack.js » Webpack-Dev-Server » Version: 1.10.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.10.0
Webpack.js » Webpack-Dev-Server » Version: 1.10.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.10.1
Webpack.js » Webpack-Dev-Server » Version: 1.11.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.11.0
Webpack.js » Webpack-Dev-Server » Version: 1.12.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.12.0
Webpack.js » Webpack-Dev-Server » Version: 1.12.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.12.1
Webpack.js » Webpack-Dev-Server » Version: 1.13.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.13.0
Webpack.js » Webpack-Dev-Server » Version: 1.14.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.14.0
Webpack.js » Webpack-Dev-Server » Version: 1.14.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.14.1
Webpack.js » Webpack-Dev-Server » Version: 1.15.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.15.0
Webpack.js » Webpack-Dev-Server » Version: 1.15.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.15.1
Webpack.js » Webpack-Dev-Server » Version: 1.15.2

cpe:2.3:a:webpack.js:webpack-dev-server:1.15.2
Webpack.js » Webpack-Dev-Server » Version: 1.16.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.0
Webpack.js » Webpack-Dev-Server » Version: 1.16.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.1
Webpack.js » Webpack-Dev-Server » Version: 1.16.2

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.2
Webpack.js » Webpack-Dev-Server » Version: 1.16.3

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.3
Webpack.js » Webpack-Dev-Server » Version: 1.16.4

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.4
Webpack.js » Webpack-Dev-Server » Version: 1.16.5

cpe:2.3:a:webpack.js:webpack-dev-server:1.16.5
Webpack.js » Webpack-Dev-Server » Version: 1.7.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.7.0
Webpack.js » Webpack-Dev-Server » Version: 1.8.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.8.0
Webpack.js » Webpack-Dev-Server » Version: 1.8.1

cpe:2.3:a:webpack.js:webpack-dev-server:1.8.1
Webpack.js » Webpack-Dev-Server » Version: 1.8.2

cpe:2.3:a:webpack.js:webpack-dev-server:1.8.2
Webpack.js » Webpack-Dev-Server » Version: 1.9.0

cpe:2.3:a:webpack.js:webpack-dev-server:1.9.0
Webpack.js » Webpack-Dev-Server » Version: 2.0.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.0.0
Webpack.js » Webpack-Dev-Server » Version: 2.1.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.1.0
Webpack.js » Webpack-Dev-Server » Version: 2.10.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.10.0
Webpack.js » Webpack-Dev-Server » Version: 2.10.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.10.1
Webpack.js » Webpack-Dev-Server » Version: 2.11.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.11.0
Webpack.js » Webpack-Dev-Server » Version: 2.11.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.11.1
Webpack.js » Webpack-Dev-Server » Version: 2.11.2

cpe:2.3:a:webpack.js:webpack-dev-server:2.11.2
Webpack.js » Webpack-Dev-Server » Version: 2.11.3

cpe:2.3:a:webpack.js:webpack-dev-server:2.11.3
Webpack.js » Webpack-Dev-Server » Version: 2.2.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.2.0
Webpack.js » Webpack-Dev-Server » Version: 2.2.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.2.1
Webpack.js » Webpack-Dev-Server » Version: 2.3.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.3.0
Webpack.js » Webpack-Dev-Server » Version: 2.4.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.0
Webpack.js » Webpack-Dev-Server » Version: 2.4.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.1
Webpack.js » Webpack-Dev-Server » Version: 2.4.2

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.2
Webpack.js » Webpack-Dev-Server » Version: 2.4.3

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.3
Webpack.js » Webpack-Dev-Server » Version: 2.4.4

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.4
Webpack.js » Webpack-Dev-Server » Version: 2.4.5

cpe:2.3:a:webpack.js:webpack-dev-server:2.4.5
Webpack.js » Webpack-Dev-Server » Version: 2.5.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.5.0
Webpack.js » Webpack-Dev-Server » Version: 2.5.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.5.1
Webpack.js » Webpack-Dev-Server » Version: 2.6.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.6.0
Webpack.js » Webpack-Dev-Server » Version: 2.6.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.6.1
Webpack.js » Webpack-Dev-Server » Version: 2.7.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.7.0
Webpack.js » Webpack-Dev-Server » Version: 2.7.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.7.1
Webpack.js » Webpack-Dev-Server » Version: 2.8.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.8.0
Webpack.js » Webpack-Dev-Server » Version: 2.8.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.8.1
Webpack.js » Webpack-Dev-Server » Version: 2.8.2

cpe:2.3:a:webpack.js:webpack-dev-server:2.8.2
Webpack.js » Webpack-Dev-Server » Version: 2.9.0

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.0
Webpack.js » Webpack-Dev-Server » Version: 2.9.1

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.1
Webpack.js » Webpack-Dev-Server » Version: 2.9.2

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.2
Webpack.js » Webpack-Dev-Server » Version: 2.9.3

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.3
Webpack.js » Webpack-Dev-Server » Version: 2.9.4

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.4
Webpack.js » Webpack-Dev-Server » Version: 2.9.5

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.5
Webpack.js » Webpack-Dev-Server » Version: 2.9.6

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.6
Webpack.js » Webpack-Dev-Server » Version: 2.9.7

cpe:2.3:a:webpack.js:webpack-dev-server:2.9.7
Webpack.js » Webpack-Dev-Server » Version: 3.0.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.0.0
Webpack.js » Webpack-Dev-Server » Version: 3.0.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.0.1
Webpack.js » Webpack-Dev-Server » Version: 3.1.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.0
Webpack.js » Webpack-Dev-Server » Version: 3.1.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.1
Webpack.js » Webpack-Dev-Server » Version: 3.1.10

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.10
Webpack.js » Webpack-Dev-Server » Version: 3.1.11

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.11
Webpack.js » Webpack-Dev-Server » Version: 3.1.12

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.12
Webpack.js » Webpack-Dev-Server » Version: 3.1.13

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.13
Webpack.js » Webpack-Dev-Server » Version: 3.1.14

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.14
Webpack.js » Webpack-Dev-Server » Version: 3.1.2

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.2
Webpack.js » Webpack-Dev-Server » Version: 3.1.3

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.3
Webpack.js » Webpack-Dev-Server » Version: 3.1.4

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.4
Webpack.js » Webpack-Dev-Server » Version: 3.1.5

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.5
Webpack.js » Webpack-Dev-Server » Version: 3.1.6

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.6
Webpack.js » Webpack-Dev-Server » Version: 3.1.7

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.7
Webpack.js » Webpack-Dev-Server » Version: 3.1.8

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.8
Webpack.js » Webpack-Dev-Server » Version: 3.1.9

cpe:2.3:a:webpack.js:webpack-dev-server:3.1.9
Webpack.js » Webpack-Dev-Server » Version: 3.2.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.2.0
Webpack.js » Webpack-Dev-Server » Version: 3.2.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.2.1
Webpack.js » Webpack-Dev-Server » Version: 3.3.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.3.0
Webpack.js » Webpack-Dev-Server » Version: 3.3.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.3.1
Webpack.js » Webpack-Dev-Server » Version: 3.4.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.4.0
Webpack.js » Webpack-Dev-Server » Version: 3.4.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.4.1
Webpack.js » Webpack-Dev-Server » Version: 3.5.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.5.0
Webpack.js » Webpack-Dev-Server » Version: 3.5.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.5.1
Webpack.js » Webpack-Dev-Server » Version: 3.6.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.6.0
Webpack.js » Webpack-Dev-Server » Version: 3.7.0

cpe:2.3:a:webpack.js:webpack-dev-server:3.7.0
Webpack.js » Webpack-Dev-Server » Version: 3.7.1

cpe:2.3:a:webpack.js:webpack-dev-server:3.7.1
Webpack.js » Webpack-Dev-Server » Version: 3.7.2

cpe:2.3:a:webpack.js:webpack-dev-server:3.7.2

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-9595

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