# CVE-2020-36894: Eibiz i-Media Server Digital Signage 3.8.0 Unauthenticated User Creation Vulnerability

> Unauthenticated attackers can create admin users via AMF manipulation, leading to full system compromise.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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:** 10 Dec 2025
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-7jj4-vc4f-6gq7

## What is CVE-2020-36894?

CVE-2020-36894 is a critical authentication bypass vulnerability in EIBIZ Co.,Ltd. i-Media Server Digital Signage, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Eibiz i-Media Server Digital Signage 3.8.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to create admin users through AMF-encoded object manipulation. Attackers can send crafted serialized objects to the /messagebroker/amf endpoint to create administrative users without authentication, bypassing security controls.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2020-36894?

It affects 1 product.


Products: Eibiz I-Media Server Digital Signage.

## How do I fix CVE-2020-36894?

No fix has been published for CVE-2020-36894 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-36894 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36894 exists.

## Other vulnerabilities in EIBIZ Co.,Ltd. i-Media Server Digital Signage

- [CVE-2020-36892](https://insights.sbomify.com/CVE-2020-36892/): Eibiz i-Media Server Digital Signage 3.8.0 Unauthenticated Privilege Escalation (critical 9.3)
- [CVE-2020-36893](https://insights.sbomify.com/CVE-2020-36893/): Eibiz i-Media Server Digital Signage 3.8.0 Directory Traversal Vulnerability (high 8.7)
- [CVE-2020-36895](https://insights.sbomify.com/CVE-2020-36895/): EIBIZ i-Media Server Digital Signage 3.8.0 Unauthenticated Configuration Disclosure (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-36894 and fix it if it is affected.

What it is: CVE-2020-36894 is a critical authentication bypass vulnerability in EIBIZ Co.,Ltd. i-Media Server Digital Signage, published on 10 Dec 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-2020-36894 exists.

Affected product: EIBIZ Co.,Ltd. i-Media Server Digital Signage. 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-2020-36894/ (Markdown: https://insights.sbomify.com/CVE-2020-36894/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-36894
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-36894
- OSV: https://osv.dev/vulnerability/CVE-2020-36894

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-36894/
Summaries are generated and may contain mistakes; the official description above is the record.