Medium severity6.8NVD Advisory· Published Oct 7, 2026
CVE-2026-107162
CVE-2026-107162
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.
Affected products
1- Range: <=1.16.11
Patches
Vulnerability mechanics
References
4- github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/policies/oauth2/oauth2-server.jsnvd
- github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/tokens/token.service.jsnvd
- github.com/ExpressGateway/express-gateway/issues/1076nvd
- www.vulncheck.com/advisories/express-gateway-through-1.16.11-oauth-2.0-refresh-token-validation-bypassnvd
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