> CVE-2026-27203 [HIGH]

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PUBLISHED
2026-02-21 00:16
MODIFIED
2026-02-21 00:16
CVSS_SCORE V3
8.3
EPSS (Prob. Exploit)
0.55%
Top 54.9%
DATA SOURCES:
NVD 🔗 2026-02-21 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 OSV 🔗 2026-03-02

> DESCRIPTION

eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions are vulnerable to Environment Variable Injection through the updateEnvFile function. The ebay_set_user_tokens tool allows updating the .env file with new tokens. The updateEnvFile function in src/auth/oauth.ts blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file. An attacker can inject arbitrary environment variables into the .env file. This could lead to configuration overwrites, Denial of Service, and potential RCE. There was no fix for this issue at the time of publication.

> 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:U/C:L/I:H/A:H
EXPLOITABILITY
2.8
IMPACT
5.5

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
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
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
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

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

> WEAKNESSES

CWE-15 CWE-74

> CWE DETAILED DESCRIPTIONS

CWE-15: External Control of System or Configuration Setting - One or more system settings or configuration elements can be externally controlled by a user. | CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component - The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

eBay API MCP Server Affected by Environment Variable Injection

AFFECTED PACKAGES:
Unknown / Unknown
20 versions affected
ALIASES:
GHSA-97rm-xj73-33jh

> HISTORIQUE DES MODIFICATIONS

Première apparition
21/02/2026 00:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-15: External Control of System or Configuration Setting - One or more system settings or configuration elements can be externally controlled by a user. | CWE-74: Improper Neutralization of Special...
Nouvelle valeur:
CWE-15: External Control of System or Configuration Setting - One or more system settings or configuration elements can be externally controlled by a user. | CWE-74: Improper Neutralization of Special...
📊 ENRICHISSEMENT 01/03/2026 06:46
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-15: External Control of System or Configuration Setting - One or more system settings or configuration elements can be externally controlled by a user. | CWE-74: Improper Neutralization of Special...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b...
https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh
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