Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-27203— eBay API MCP Server Affected by Environment Variable Injection

Quick assessment

Affected
YosefHayim ebay-mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

eBay API MCP Server是YosefHayim个人开发者的一个上下文协议服务器。 eBay API MCP Server存在注入漏洞，该漏洞源于updateEnvFile函数存在环境变量注入，可能导致配置覆盖、拒绝服务和潜在远程代码执行。

CVSS 8.3 · High EPSS 0.36% · P29
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-27203

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
eBay API MCP Server Affected by Environment Variable Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
系统设置或配置在外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
eBay API MCP Server 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
eBay API MCP Server是YosefHayim个人开发者的一个上下文协议服务器。 eBay API MCP Server存在注入漏洞，该漏洞源于updateEnvFile函数存在环境变量注入，可能导致配置覆盖、拒绝服务和潜在远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
YosefHayim ebay-mcp <= 1.7.2 -

II. Public POCs for CVE-2026-27203

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-27203

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same weakness: CWE-15

V. Comments for CVE-2026-27203

No comments yet

Leave a comment