# CVE-2026-100391: MediaFlow Proxy through 2.4.9 Server-Side Request Forgery via Incomplete Validation

> Remote attackers can exploit incomplete validation in MediaFlow Proxy to read internal resources and cloud metadata via Server-Side Request Forgery.

- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Sep 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-5j62-5j8p-jpqh

## What is CVE-2026-100391?

CVE-2026-100391 is a high-severity server-side request forgery vulnerability in mhdzumair mediaflow-proxy, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MediaFlow Proxy through 2.4.9 contains a server-side request forgery vulnerability in the /proxy routes due to missing and incomplete destination validation in the d query parameter. Remote attackers can supply arbitrary internal URLs including loopback and cloud metadata endpoints to read full responses from the proxy server.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-100391?


## How do I fix CVE-2026-100391?

No fix has been published for CVE-2026-100391 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100391 being exploited?

There is no known exploitation of CVE-2026-100391 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100391 and fix it if it is affected.

What it is: CVE-2026-100391 is a high-severity server-side request forgery vulnerability in mhdzumair mediaflow-proxy, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-100391 in the wild and no public exploit code.

Affected product: mhdzumair mediaflow-proxy. 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-2026-100391/ (Markdown: https://insights.sbomify.com/CVE-2026-100391/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100391
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100391
- OSV: https://osv.dev/vulnerability/CVE-2026-100391

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100391/
Summaries are generated and may contain mistakes; the official description above is the record.