CVE-2026-36738 Missing authorization in n/a
An attacker with physical access can connect to the UART interface to gain unrestricted control over the router due to missing authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-36738?
CVE-2026-36738 is a medium-severity missing authorization vulnerability in n/a, published on 13 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Incorrect Access Control. The device exposes a UART interface that lacks authentication, authorization, or access control mechanisms. An attacker with physical access to the UART pins can connect to the interface and gain unrestricted access to device functionality.
Weakness: CWE-284
Which versions are affected by CVE-2026-36738?
It affects 1 product.
Products include U-Speed T18-21k Firmware.
How do I fix CVE-2026-36738?
No fix has been published for CVE-2026-36738 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-2026-36738 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-36738 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-hxf8-x6wv-3579.