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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34198 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34198

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34198 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34198

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.