# CVE-2023-0750: Yellowbrik PEC-1864 authentication bypass

> Attackers can bypass client-side JavaScript authentication to modify device settings, compromising stream integrity and causing denial of service.

- **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:** 6 Apr 2023
- **Updated:** 10 Feb 2025
- **Also known as:** GHSA-x7hm-jh97-58mq

## What is CVE-2023-0750?

CVE-2023-0750 is a critical authentication bypass vulnerability in Lynx Technik AG Yellowbrik, published on 6 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Yellobrik PEC-1864 implements authentication checks via javascript in the frontend interface.  When the device can be accessed over the network an attacker could bypass authentication.

This would allow an attacker to : 
- Change the password, resulting in a DOS of the users

- Change the streaming source, compromising the integrity of the stream

- Change the streaming destination, compromising the confidentiality of the stream

This issue affects Yellowbrik: PEC 1864. No patch has been issued by the manufacturer as this model was discontinued.

Weakness: CWE-311 (Missing Encryption of Sensitive Data), CWE-602 (Client-Side Enforcement of Server-Side Security)

## Which versions are affected by CVE-2023-0750?

It affects 1 product.


Products: Lynx-Technik Yellobrik Pec 1864 Firmware.

## How do I fix CVE-2023-0750?

No fix has been published for CVE-2023-0750 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-0750 being exploited?

There is no known exploitation of CVE-2023-0750 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0750 and fix it if it is affected.

What it is: CVE-2023-0750 is a critical authentication bypass vulnerability in Lynx Technik AG Yellowbrik, published on 6 Apr 2023. 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-2023-0750 in the wild and no public exploit code.

Affected product: Lynx Technik AG Yellowbrik. 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-2023-0750/ (Markdown: https://insights.sbomify.com/CVE-2023-0750/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0750
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0750
- OSV: https://osv.dev/vulnerability/CVE-2023-0750

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0750/
Summaries are generated and may contain mistakes; the official description above is the record.