# CVE-2026-52748: Missing authentication for backup functionality in Kaon AR2140X

> Unauthenticated attackers can trigger configuration backups, causing denial of service and potentially exposing encrypted configuration data.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-vcfv-29fp-vc3c

## What is CVE-2026-52748?

CVE-2026-52748 is a high-severity missing authorization vulnerability in Kaon AR2140, published on 28 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Kaon AR2140X router contains a vulnerability where the backup functionality is accessible without authentication. This allows an unauthenticated remote attacker to trigger a configuration backup and retrieve it in a form encrypted by a device-specific key. Triggering this function renders the router inoperable for a substantial period of time. 

This issue was identified in firmware versions up to 4.2.17. Status of newer versions remains unknown.

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

## Which versions are affected by CVE-2026-52748?


## How do I fix CVE-2026-52748?

No fix has been published for CVE-2026-52748 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-52748 being exploited?

There is no known exploitation of CVE-2026-52748 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52748 and fix it if it is affected.

What it is: CVE-2026-52748 is a high-severity missing authorization vulnerability in Kaon AR2140, published on 28 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-52748 in the wild and no public exploit code.

Affected product: Kaon AR2140. 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-2026-52748/ (Markdown: https://insights.sbomify.com/CVE-2026-52748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52748
- OSV: https://osv.dev/vulnerability/CVE-2026-52748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52748/
Summaries are generated and may contain mistakes; the official description above is the record.