Medium 6.8Published Oct 7, 2026

CVE-2026-107162Express Gateway through 1.16.11 OAuth 2.0 Refresh Token Validation Bypass

Updated under an hour ago (2026-10-19 11:40 UTC)

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It affects ExpressGateway express-gateway. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ExpressGateway express-gateway

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ExpressGateway express-gateway expressgateway:express_gateway (from the name)	through 1.16.11	CNA record

References

https://github.com/ExpressGateway/express-gateway/issues/1076issue-tracking
https://github.com/ExpressGateway/express-gatewayproduct
https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/policies/oauth2/oauth2-server.js#L221-L247technical-description
https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/tokens/token.service.js#L100-L136technical-description
https://www.vulncheck.com/advisories/express-gateway-through-1.16.11-oauth-2.0-refresh-token-validation-bypassthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.