CVE-2026-34198: Coolify: Password reset link poisoning via X-Forwarded-Host header spoofing
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.471, the TrustProxies middleware trusts all proxies ($proxies = ''), accepting X-Forwarded-Host from any source. The TrustHosts middleware, intended to prevent host header attacks, has a circular caching dependency that prevents it from ever validating hosts. When a password reset is requested, the ResetPassword notification generates the reset URL using url(route(..., false)), which derives the host from the (spoofable) request. An unauthenticated attacker can trigger a password reset email containing a link pointing to an attacker-controlled domain, enabling token theft and account takeover. This issue is fixed in version 4.0.0-beta.471.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Coolifyto a version that resolves this vulnerability.Fixed in 4.0.0-beta.471 - Configuration
Upgrade to 4.0.0-beta.471, which fixes the TrustProxies middleware behavior that previously trusted all proxies ($proxies = '*') and allowed spoofed X-Forwarded-Host to be accepted from any source.
Coolify (TrustProxies middleware) $proxies = * - Configuration
Upgrade to 4.0.0-beta.471, which fixes ResetPassword reset URL generation (previously derived the host from the spoofable request via url(route(..., false))) to prevent links to attacker-controlled domains.
Coolify (ResetPassword notification) reset URL host derivation (url(route(..., false))) = uses spoofable request host
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34198?
CVE-2026-34198 has a medium severity rating of 5.3.
How do I fix CVE-2026-34198?
To mitigate CVE-2026-34198, upgrade Coolify to version 4.0.0-beta.471 or later.
What type of vulnerability is CVE-2026-34198?
CVE-2026-34198 is a password reset link poisoning vulnerability that occurs via X-Forwarded-Host header spoofing.
What software does CVE-2026-34198 affect?
CVE-2026-34198 affects the open-source tool Coolify prior to version 4.0.0-beta.471.
How does CVE-2026-34198 impact security?
CVE-2026-34198 can potentially lead to unauthorized access due to inadequate validation of host headers.