GHSA-97rm-xj73-33jh · Severity: high · Ecosystem: npm — eBay API MCP Server Affected by Environment Variable Injection
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.
Conclusion & alert: CVE-2026-27203 is rated Moderate Risk (43.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.36%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.04% | 0.36% | +0.32% |
| 2 | 2026-02-21 | — | 0.04% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.3 | 3.1 | HIGH |
|
2.8 | 5.5 | [email protected] |
GHSA-97rm-xj73-33jh · Severity: high · Ecosystem: npm — eBay API MCP Server Affected by Environment Variable Injection
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||