CVE-2026-107162
Express Gateway through 1.16.11 contains an authentication bypass vulnerability in the OAuth 2.0…
- Risk score
- 45/100
- CVSS
- 6.8 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 7 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 …
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.8 medium
References
- https://github.com/ExpressGateway/express-gateway
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/policies/oauth2/oauth2-server.js#L221-L247
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/tokens/token.service.js#L100-L136
- https://github.com/ExpressGateway/express-gateway/issues/1076
- https://www.vulncheck.com/advisories/express-gateway-through-1.16.11-oauth-2.0-refresh-token-validation-bypass
- https://github.com/ExpressGateway/express-gateway/issues/1076
Original 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.
Last activity 7 Oct 2026. Patch Forecast updates every hour.