> CVE-2026-66005 [MEDIUM]

« BACK_TO_HOME
PUBLISHED
2026-07-24 15:19
MODIFIED
2026-07-24 15:19
CVSS_SCORE V3
5.3
EPSS (Prob. Exploit)
0.33%
Top 75.0%
DATA SOURCES:
NVD đź”— 2026-07-24 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 OSV đź”— 2026-07-31

> DESCRIPTION

Jan through 0.8.4, fixed in commit 3e1c1e7, contains a CORS misconfiguration vulnerability in its local API server that allows network-adjacent attackers to bypass trusted host restrictions by exploiting the server's replacement of user-configured trusted hosts with a wildcard that reflects arbitrary origins with credentials. Attackers on the local network or using DNS rebinding can reach the unauthenticated OpenAI-compatible API to perform inference, enumerate models, invoke MCP tools, and read cross-origin responses.

> AFFECTED_PRODUCTS

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

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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
Unknown (P)
Interaction inconnue
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-183 CWE-942

> CWE DETAILED DESCRIPTIONS

CWE-183: Permissive List of Allowed Inputs - The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are explicitly allowed by policy because the inputs are assumed to be safe, but the list is too permissive - that is, it allows an input that is unsafe, leading to resultant weaknesses. | CWE-942: Permissive Cross-domain Security Policy with Untrusted Domains - The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Jan Local API Server CORS Origin Reflection via 0.0.0.0 Binding

AFFECTED PACKAGES:
Unknown / Unknown
102 versions affected

> HISTORIQUE DES MODIFICATIONS

Première apparition
24/07/2026 15:19
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-183: Permissive List of Allowed Inputs - The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are explicitly allowed by policy because the i...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/janhq/jan/commit/3e1c1e724f696620d89bb4a9cc18a380e0753757
https://github.com/janhq/jan/issues/8453
https://github.com/janhq/jan/pull/8506
https://www.vulncheck.com/advisories/jan-local-api-server-cors-origin-reflection...
« BACK_TO_HOME