CVE-2026-107162CWE-287

CVE-2026-107162

Medium · published October 7, 2026

CVSS v3.1
6.8
EPSS
0%
Percentile
20.1
In the wild
Unconfirmed
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 impersonate them against oauth2-protected APIs.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
7.6 · 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
EPSS
0.00287 · 20.1th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-10-07T17:17Z
References (6)
https://github.com/ExpressGateway/express-gateway · [email protected]https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/policies/oauth2/oauth2-server.js#L221-L247 · [email protected]https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/tokens/token.service.js#L100-L136 · [email protected]https://github.com/ExpressGateway/express-gateway/issues/1076 · [email protected]https://www.vulncheck.com/advisories/express-gateway-through-1.16.11-oauth-2.0-refresh-token-validation-bypass · [email protected]https://github.com/ExpressGateway/express-gateway/issues/1076 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 09 OCT 03:26Z
    EPSS moved — → 0%
    epss
  • 07 OCT 12:48Z
    Express Gateway through 1.16.11 OAuth 2.0 Refresh Token Validation Bypass
    cvelistv5