PT-2026-21328 · Ebay · Ebay Api Mcp Server
Nedlir
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Published
2026-02-19
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Updated
2026-05-06
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CVE-2026-27203
CVSS v3.1
8.3
High
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
eBay API MCP Server (all versions)
Description
An environment variable injection issue exists in the
updateEnvFile function located in src/auth/oauth.ts. The ebay set user tokens tool allows updating the .env file with new tokens, but the updateEnvFile function appends or replaces values without validating them for quotes or newlines. This lack of sanitization enables an attacker to inject arbitrary environment variables into the configuration file. Potential impacts include configuration overwrites, such as hijacking OAuth flows by modifying EBAY REDIRECT URI, Denial of Service by injecting invalid configurations, and Remote Code Execution (RCE) by controlling variables like NODE OPTIONS.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
As a temporary workaround, restrict access to the
ebay set user tokens tool and the updateEnvFile function to minimize the risk of exploitation.Exploit
DoS
RCE
Special Elements Injection
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Related Identifiers
Affected Products
Ebay Api Mcp Server