CVE-2026-107177: Expressgateway Express-Gateway

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• Expressgateway Express-Gateway: up to and including 1.16.11

Published 2026-10-07. Last modified 2026-10-07.