> CVE-2026-9595 [MEDIUM]

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PUBLISHED
2026-06-15 16:16
MODIFIED
2026-06-15 16:16
CVSS_SCORE V3
5.3
EPSS (Prob. Exploit)
0.16%
Top 94.5%
DATA SOURCES:
NVD 🔗 2026-06-15 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-01 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-02

> DESCRIPTION

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 [email protected]. 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EXPLOITABILITY
3.9
IMPACT
1.4

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-346 CWE-441

> CWE DETAILED DESCRIPTIONS

CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-441: Unintended Proxy or Intermediary - The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere.

> RED HAT SECURITY ADVISORIES

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> GITHUB SECURITY ADVISORY

GHSA-mx8g-39q3-5c79 MODERATE

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

AFFECTED PACKAGES:
NPM / webpack-dev-server
< 5.2.5
Fixed in: 5.2.5

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

AFFECTED PACKAGES:
Unknown / Unknown
224 versions affected
ALIASES:
GHSA-mx8g-39q3-5c79

> HISTORIQUE DES MODIFICATIONS

Première apparition
15/06/2026 16:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') - The product...
Nouvelle valeur:
CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-441: Unintended Proxy or Intermediary - The product receives a request,...
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-346: Origin Validation Error - The product does not properly verify that the source of data or communication is valid. | CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') - The product...
Total des modifications: 2 Dernière mise à jour: 6 days ago

> REFERENCES

https://cna.openjsf.org/security-advisories.html
https://github.com/facebook/create-react-app/pull/7444
https://github.com/vuejs/vue-cli/commit/72ba7505aff2a8314e82aa5082379a77504a1fcb
https://github.com/webpack/webpack-dev-server/pull/4316
https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-mx8g-39q3...
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