CVE-2026-0204 Missing authorization in SonicOS

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, CWE-1390

Which versions are affected by CVE-2026-0204?

It affects 1 product.

Products include 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.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

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 SonicWall SonicOS Buffer Overflow Exploited Critical 9.8
• CVE-2024-40766 SonicWall SonicOS Improper Access Control Exploited Critical 9.3
• CVE-2024-53704 SonicWall SonicOS SSLVPN Improper Authentication Exploited High 8.2
• CVE-2025-40600 Denial of service in SonicOS Critical 9.8
• CVE-2024-22394 Auth bypass in SonicOS Critical 9.8

All Sonicwall Sonicos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-c5fx-h6fr-53h9.