# CVE-2026-0204: Missing authorization in SonicOS

> Attackers can access restricted management interface functions on SonicWall firewalls due to flawed access control mechanisms.

- **Severity:** High 8.0 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Apr 2026
- **Updated:** 30 Apr 2026
- **Also known as:** GHSA-c5fx-h6fr-53h9

## What is CVE-2026-0204?

CVE-2026-0204 is a high-severity missing authorization vulnerability in Sonicwall Sonicos, published on 29 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the access control mechanism of SonicOS may allow certain management interface functions to be accessible under specific conditions.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-1390 (Weak Authentication)

## Which versions are affected by CVE-2026-0204?

It affects 1 product.


Products: Sonicwall Sonicos.

## How do I fix CVE-2026-0204?

No fix has been published for CVE-2026-0204 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-0204 being exploited?

There is no known exploitation of CVE-2026-0204 in the wild and no public exploit code.

## Other vulnerabilities in Sonicwall Sonicos

- [CVE-2020-5135](https://insights.sbomify.com/CVE-2020-5135/): SonicWall SonicOS Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-40766](https://insights.sbomify.com/CVE-2024-40766/): SonicWall SonicOS Improper Access Control (critical 9.3, exploited in the wild)
- [CVE-2024-53704](https://insights.sbomify.com/CVE-2024-53704/): SonicWall SonicOS SSLVPN Improper Authentication (high 8.2, exploited in the wild)
- [CVE-2025-40600](https://insights.sbomify.com/CVE-2025-40600/): Denial of service in SonicOS (critical 9.8)
- [CVE-2024-22394](https://insights.sbomify.com/CVE-2024-22394/): Auth bypass in SonicOS (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-0204 and fix it if it is affected.

What it is: CVE-2026-0204 is a high-severity missing authorization vulnerability in Sonicwall Sonicos, published on 29 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-0204 in the wild and no public exploit code.

Affected product: Sonicwall Sonicos. 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-2026-0204/ (Markdown: https://insights.sbomify.com/CVE-2026-0204/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-0204
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0204
- OSV: https://osv.dev/vulnerability/CVE-2026-0204

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-0204/
Summaries are generated and may contain mistakes; the official description above is the record.