# CVE-2026-34198: Coolify: Password reset link poisoning via X-Forwarded-Host header spoofing

> Attackers can spoof the Host header to poison password reset links, stealing tokens and taking over user accounts in Coolify.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Jul 2026
- **Updated:** 7 Jul 2026
- **Also known as:** GHSA-cgj8-7m5q-x5gv

## What is CVE-2026-34198?

CVE-2026-34198 is a medium-severity vulnerability in coollabsio coolify, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-640 (Weak Password Recovery Mechanism for Forgotten Password), CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2026-34198?


## How do I fix CVE-2026-34198?

No fix has been published for CVE-2026-34198 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34198 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34198 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34198 and fix it if it is affected.

What it is: CVE-2026-34198 is a medium-severity vulnerability in coollabsio coolify, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34198 exists.

Affected product: coollabsio coolify. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34198/ (Markdown: https://insights.sbomify.com/CVE-2026-34198/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34198
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34198
- OSV: https://osv.dev/vulnerability/CVE-2026-34198

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34198/
Summaries are generated and may contain mistakes; the official description above is the record.