CVEvulnerability
CVE-2026-107162
7.6 HIGH
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-10-07
- Last modified
- 2026-10-10
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 7.6 HIGH — CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 6.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-287
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.
Related
Weakness · CWE (1)
- CWE-287 Improper Authentication weakness
References
- https://github.com/ExpressGateway/express-gateway github.com
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/policies/oauth2/oauth2-server.js#L221-L247 github.com
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/tokens/token.service.js#L100-L136 github.com
- https://github.com/ExpressGateway/express-gateway/issues/1076 github.com
- https://www.vulncheck.com/advisories/express-gateway-through-1.16.11-oauth-2.0-refresh-token-validation-bypass www.vulncheck.com
- https://github.com/ExpressGateway/express-gateway/issues/1076 github.com