Vulnerability in Expressgateway Express-Gateway
CVE-2026-107177
Express Gateway through 1.16.11 contains a hardcoded cryptographic key vulnerability that allows attackers with datastore access to decrypt stored OAuth 2.0 token secrets via the default crypto.cipherKey 'sensitiveKey'. Attackers who can read Redis can decrypt tokenEncrypted values and combine them with stored token IDs to obtain valid bearer tokens for any user.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ExpressGateway/express-gateway/issues/1078 (issue-tracking)
- github.com/ExpressGateway/express-gateway (product)
- github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab… (technical-description)
- github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab… (technical-description)
- www.vulncheck.com/advisories/express-gateway-through-1.16.11-hardcoded-default-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-107177?
- CVE-2026-107177 is a medium-severity vulnerability in Expressgateway Express-Gateway, classified under CWE-1394. CVSS score: 5.9/10. Published 2026-10-07.
- How severe is CVE-2026-107177?
- Medium severity. CVSS v3 base score is 5.9 out of 10.