CVE-2026-21004 Auth bypass in Smart Switch

Medium 6.9 Published 16 Mar 2026 Updated 16 Mar 2026

Adjacent attackers can trigger a denial of service in Samsung Smart Switch due to improper authentication, requiring an upgrade to mitigate.

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: None listed

What is CVE-2026-21004?

CVE-2026-21004 is a medium-severity authentication bypass vulnerability in Samsung Mobile Smart Switch, published on 16 Mar 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

Improper authentication in Smart Switch prior to version 3.7.69.15 allows adjacent attackers to trigger a denial of service.

Weakness: CWE-287

Which versions are affected by CVE-2026-21004?

It affects 1 product.

Products include Samsung Smart Switch.

How do I fix CVE-2026-21004?

No fix has been published for CVE-2026-21004 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-21004 being exploited?

There is no known exploitation of CVE-2026-21004 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-q28g-7mpq-xfp7.