Unintended Proxy or Intermediary ('Confused Deputy') Affecting github.com/coder/coder/enterprise package, versions >=0.0.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCODERCODERENTERPRISE-17872215
- published6 Jul 2026
- disclosed6 Jul 2026
- creditUnknown
Introduced: 6 Jul 2026
CVE-2026-55430 (opens in a new tab)How to fix?
There is no fixed version for github.com/coder/coder/enterprise.
Overview
Affected versions of this package are vulnerable to Unintended Proxy or Intermediary ('Confused Deputy') in the httpapi.RequestHost process. An attacker can gain unauthorized access to sensitive data by sending requests with a crafted X-Forwarded-Host header, which is trusted over the real Host header, allowing cross-app data access when subdomain app routing is enabled and the upstream proxy does not strip the header. This is only exploitable if subdomain app routing (wildcard hostname) is enabled, a victim visits the attacker's shared app, and the deployment's upstream proxy does not strip X-Forwarded-Host.
Workaround
This vulnerability can be mitigated by placing an upstream reverse proxy that strips or overwrites X-Forwarded-Host on untrusted requests.