# CVE-2025-50578: Open redirect in n/a

> An attacker can manipulate HTTP headers to redirect users to malicious sites, enabling phishing and session theft in the Heimdall application.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jul 2025
- **Updated:** 30 Jul 2025
- **Also known as:** GHSA-2c6m-gpf4-cfgp

## What is CVE-2025-50578?

CVE-2025-50578 is a critical vulnerability in n/a, published on 30 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

LinuxServer.io heimdall 2.6.3-ls307 contains a vulnerability in how it handles user-supplied HTTP headers, specifically `X-Forwarded-Host` and `Referer`. An unauthenticated remote attacker can manipulate these headers to perform Host Header Injection and Open Redirect attacks. This allows the loading of external resources from attacker-controlled domains and unintended redirection of users, potentially enabling phishing, UI redress, and session theft. The vulnerability exists due to insufficient validation and trust of untrusted input, affecting the integrity and trustworthiness of the application.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), CWE-601 (URL Redirection to Untrusted Site), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-50578?

It affects 1 product.


Products: Linuxserver Docker-Heimdall.

## How do I fix CVE-2025-50578?

No fix has been published for CVE-2025-50578 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-50578 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50578 exists.

Public exploit code:

- Heimdall - Host Header Injection & Open Redirect (nuclei): http/cves/2025/CVE-2025-50578.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-50578 and fix it if it is affected.

What it is: CVE-2025-50578 is a critical vulnerability in n/a, published on 30 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50578 exists.

Affected product: n/a. 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-2025-50578/ (Markdown: https://insights.sbomify.com/CVE-2025-50578/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-50578
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-50578
- OSV: https://osv.dev/vulnerability/CVE-2025-50578

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-50578/
Summaries are generated and may contain mistakes; the official description above is the record.