CVE-2026-107162
Medium
Description
Express Gateway through 1.16.11 contains an authentication bypass vulnerability in the OAuth 2.0 refresh_token grant that fails to validate the token secret or issuing client. Attackers with any valid client credentials and the identifier portion of another user's refresh token can obtain that user's access token and impersonate them against oauth2-protected APIs.
SeverityMedium
CVSS6.8
Exploit probability—
ProductExpressgateway Express-gateway
PublishedOct 7, 2026
First seenOct 7, 2026
Weakness typeCWE-287Improper authentication
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ExpressGateway express-gateway | v ≤ 1.16.11 | — |
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