webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
Impact
When webpack-dev-server is running on a non-HTTPS origin (the default), cross-origin requests from malicious websites can load the dev server's JavaScript bundles via <script> tags. The fix introduced in v5.2.1 (CVE-2025-30359) relied on Sec-Fetch-Mode and Sec-Fetch-Site request headers to block these requests, but browsers only send these headers for potentially trustworthy origins. Over plain HTTP, the headers are absent and the check is bypassed.
An attacker who knows the dev server's host, port, and output path can exfiltrate all module source code by intercepting the webpack runtime's module registration.
This does not affect Chrome 142+ (and other Chromium-based browsers) due to local network access restrictions.
Patches
Patched in webpack-dev-server >= 5.2.4 by setting Cross-Origin-Resource-Policy: same-origin on responses.
Workarounds
Run the dev server with HTTPS enabled (--https or server.type: 'https' in config).
Resources
- GHSA-4v9v-hfq4-rm2v (CVE-2025-30359) - original vulnerability
- GHSA-9jgg-88mc-972h (CVE-2025-30360) - prior bypass
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | webpack-dev-server | < 5.2.4 | 5.2.4 |
Referencias
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-4v9v-hfq4-rm2v
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-79cf-xcqc-c78w
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h
- https://nvd.nist.gov/vuln/detail/CVE-2026-6402
- https://cna.openjsf.org/security-advisories.html
- https://github.com/webpack/webpack-dev-server
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-749- Plataforma
- npm
- Paquete
webpack-dev-server- Publicada
- 18.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-79cf-xcqc-c78w - CC BY 4.0
Historial de vulnerabilidades: webpack-dev-server
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 7
- Primera → última
- 01.2019 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Media 6
Divulgaciones por año
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 4
-
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.