# CVE-2026-73819: Ebyte NA111-M Weak Authentication

> An unauthenticated attacker on the adjacent network can bypass authentication to modify critical settings and change access credentials on the Ebyte NA111-M device.

- **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:** 31 Aug 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-qww8-jv59-fcxh

## What is CVE-2026-73819?

CVE-2026-73819 is a critical authentication bypass vulnerability in Ebyte NA111-M Firmware, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The affected Ebyte 

product's vendor configuration utility permits access to administrative 
functions without verifying the operator's identity under certain 
credential conditions. An unauthenticated attacker on the adjacent 
network could modify critical settings or change access credentials, 
potentially preventing legitimate administrators from managing the 
device.

Weakness: CWE-1390 (Weak Authentication)

## Which versions are affected by CVE-2026-73819?


## How do I fix CVE-2026-73819?

No fix has been published for CVE-2026-73819 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73819 being exploited?

There is no known exploitation of CVE-2026-73819 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73819 and fix it if it is affected.

What it is: CVE-2026-73819 is a critical authentication bypass vulnerability in Ebyte NA111-M Firmware, published on 31 Aug 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-2026-73819 in the wild and no public exploit code.

Affected product: Ebyte NA111-M Firmware. 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-2026-73819/ (Markdown: https://insights.sbomify.com/CVE-2026-73819/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73819
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73819
- OSV: https://osv.dev/vulnerability/CVE-2026-73819

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73819/
Summaries are generated and may contain mistakes; the official description above is the record.