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10 vulnerabilities found for webpack-dev-server by webpack.js
CVE-2026-9595 (GCVE-0-2026-9595)
Vulnerability from nvd – Published: 2026-06-15 15:00 – Updated: 2026-06-15 16:08
VLAI
Title
webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack-dev-server | webpack-dev-server |
Affected:
0 , < 5.2.5
(semver)
Unaffected: 5.2.5 (semver) |
Credits
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CVE-2026-6402 (GCVE-0-2026-6402)
Vulnerability from nvd – Published: 2026-05-12 07:45 – Updated: 2026-05-12 13:00
VLAI
Title
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack-dev-server | webpack-dev-server |
Affected:
0 , < 5.2.4
(semver)
Unaffected: 5.2.4 (semver) |
Credits
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CVE-2025-30360 (GCVE-0-2025-30360)
Vulnerability from nvd – Published: 2025-06-03 17:41 – Updated: 2025-06-03 17:58
VLAI
Title
webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
Summary
webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-346 - Origin Validation Error
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-server/sec… | x_refsource_CONFIRM |
| https://github.com/webpack/webpack-dev-server/com… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-server/com… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-server/blo… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack | webpack-dev-server |
Affected:
< 5.2.1
|
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CVE-2025-30359 (GCVE-0-2025-30359)
Vulnerability from nvd – Published: 2025-06-03 17:39 – Updated: 2025-06-03 17:50
VLAI
Title
webpack-dev-server users' source code may be stolen when they access a malicious web site
Summary
webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables. By using `Function::toString` against the values in `__webpack_modules__`, the attacker can get the source code. Version 5.2.1 contains a patch for the issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-server/sec… | x_refsource_CONFIRM |
| https://github.com/webpack/webpack-dev-server/com… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack | webpack-dev-server |
Affected:
< 5.2.1
|
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CVE-2018-14732 (GCVE-0-2018-14732)
Vulnerability from nvd – Published: 2018-09-21 17:00 – Updated: 2024-08-05 09:38
VLAI
Summary
An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1:8080/ connection from any origin.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
3 references
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|---|---|
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Date Public
2018-09-20 00:00
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CVE-2026-9595 (GCVE-0-2026-9595)
Vulnerability from cvelistv5 – Published: 2026-06-15 15:00 – Updated: 2026-06-15 16:08
VLAI
Title
webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack-dev-server | webpack-dev-server |
Affected:
0 , < 5.2.5
(semver)
Unaffected: 5.2.5 (semver) |
Credits
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CVE-2026-6402 (GCVE-0-2026-6402)
Vulnerability from cvelistv5 – Published: 2026-05-12 07:45 – Updated: 2026-05-12 13:00
VLAI
Title
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack-dev-server | webpack-dev-server |
Affected:
0 , < 5.2.4
(semver)
Unaffected: 5.2.4 (semver) |
Credits
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CVE-2025-30360 (GCVE-0-2025-30360)
Vulnerability from cvelistv5 – Published: 2025-06-03 17:41 – Updated: 2025-06-03 17:58
VLAI
Title
webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
Summary
webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-346 - Origin Validation Error
Assigner
References
4 references
| URL | Tags |
|---|---|
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| https://github.com/webpack/webpack-dev-server/blo… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
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| webpack | webpack-dev-server |
Affected:
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CVE-2025-30359 (GCVE-0-2025-30359)
Vulnerability from cvelistv5 – Published: 2025-06-03 17:39 – Updated: 2025-06-03 17:50
VLAI
Title
webpack-dev-server users' source code may be stolen when they access a malicious web site
Summary
webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables. By using `Function::toString` against the values in `__webpack_modules__`, the attacker can get the source code. Version 5.2.1 contains a patch for the issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-server/sec… | x_refsource_CONFIRM |
| https://github.com/webpack/webpack-dev-server/com… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| webpack | webpack-dev-server |
Affected:
< 5.2.1
|
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CVE-2018-14732 (GCVE-0-2018-14732)
Vulnerability from cvelistv5 – Published: 2018-09-21 17:00 – Updated: 2024-08-05 09:38
VLAI
Summary
An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1:8080/ connection from any origin.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-server/iss… | x_refsource_CONFIRM |
| https://blog.cal1.cn/post/Sniffing%20Codes%20in%2… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-server/com… | x_refsource_CONFIRM |
Date Public
2018-09-20 00:00
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