> CVE-2026-71424 [CRITICAL]

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PUBLISHED
2026-08-17 22:17
MODIFIED
2026-08-17 22:17
CVSS_SCORE V3
9.6
EPSS (Prob. Exploit)
0.49%
Top 59.4%
DATA SOURCES:
NVD 🔗 2026-08-17 CWE MITRE 🔗 2026-09-01 FIRST EPSS 🔗 2026-10-18 OSV 🔗 2026-10-26

> DESCRIPTION

Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.

> 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:L/UI:N/S:C/C:H/I:H/A:N
EXPLOITABILITY
3.1
IMPACT
5.8

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
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
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-200 CWE-863

> CWE DETAILED DESCRIPTIONS

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. | CWE-863: Incorrect Authorization - The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers

AFFECTED PACKAGES:
Unknown / Unknown
1258 versions affected
ALIASES:
GHSA-q62f-rv3h-f822

> HISTORIQUE DES MODIFICATIONS

Première apparition
17/08/2026 22:17
Source: NVD
📊 ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. | CWE-...
Total des modifications: 1 Dernière mise à jour: 1 month ago

> REFERENCES

https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d89001...
https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed5677...
https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e54245763...
https://github.com/onyx-dot-app/onyx/pull/11238
https://github.com/onyx-dot-app/onyx/pull/11242
https://github.com/onyx-dot-app/onyx/pull/11243
https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0
https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822
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