Vulnerability · Published Oct 7, 2026 · Assigned by VulnCheck
CVE-2026-107177Express Gateway through 1.16.11 Hardcoded Default cipherKey Exposes OAuth Tokens
Medium 5.9
In plain English
A medium-severity security flaw in express-gateway from ExpressGateway. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 75.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ExpressGateway | express-gateway | 0 – through 1.16.11 |
Weakness: CWE-1394 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
References
- GitHub Issue #1078 issue-tracking
- https://github.com/ExpressGateway/express-gateway product
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/config/system.config.yml#L15-L22 technical-description
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/utils.js#L18-L28 technical-description
- VulnCheck Advisory: Express Gateway through 1.16.11 Hardcoded Default cipherKey Exposes OAuth Tokens third-party-advisory