PatchSiren cyber security CVE debrief
CVE-2026-34198 coollabsio CVE debrief
CVE-2026-34198 is a medium-severity vulnerability in Coolify, an open-source tool for managing servers, applications, and databases. The TrustProxies middleware trusts all proxies, accepting X-Forwarded-Host from any source. The TrustHosts middleware has a circular caching dependency that prevents host validation. This allows unauthenticated attackers to trigger password reset emails with links pointing to attacker-controlled domains, enabling token theft and account takeover. Affected deployments should be identified, and owners assigned for follow-up.
- Vendor
- coollabsio
- Product
- coolify
- CVSS
- MEDIUM 5.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-07
- Original CVE updated
- 2026-07-07
- Advisory published
- 2026-07-07
- Advisory updated
- 2026-07-07
Who should care
Users of Coolify versions prior to 4.0.0-beta.471 should be aware of this vulnerability and take steps to mitigate it. This includes updating to the latest version and verifying the configuration of the TrustProxies and TrustHosts middleware. Operators, platform administrators, vulnerability management teams, and security teams may be impacted.
Technical summary
The TrustProxies middleware in Coolify trusts all proxies by setting $proxies to '*', making it vulnerable to spoofing attacks. The TrustHosts middleware, intended to prevent host header attacks, has a circular caching dependency that prevents it from validating hosts. When a password reset is requested, the ResetPassword notification generates a reset URL using url(route(..., false)), which derives the host from the request. This allows an unauthenticated attacker to trigger a password reset email containing a link pointing to an attacker-controlled domain, enabling token theft and account takeover.
Defensive priority
High
Recommended defensive actions
- Update to Coolify version 4.0.0-beta.471 or later
- Verify the configuration of the TrustProxies and TrustHosts middleware
- Monitor for suspicious password reset requests
- Implement additional security measures to prevent account takeover
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
Evidence notes
The CVE record was published on 2026-07-07T04:17:50.847Z and last modified on 2026-07-07T14:16:30.377Z. The NVD entry is currently Deferred. Evidence is limited, and defenders should verify the affected scope and vendor guidance with caution.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-07T04:17:50.847Z and has not been modified since then. The NVD entry is currently Deferred.