CVE-2026-4346 Cleartext Storage of Administrative and Wi-Fi Credentials via Accessible Serial Interface in TP Link's TL-WR850N
Attackers with physical access can extract cleartext admin and Wi-Fi credentials via the serial interface, leading to full device control.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4346?
CVE-2026-4346 is a medium-severity vulnerability in TP-Link Systems Inc. TL-WR850N v3, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The vulnerability affecting TL-WR850N v3 allows cleartext storage of administrative and Wi-Fi credentials in a region of the device’s flash memory while the serial interface remains enabled and protected by weak authentication. An attacker with physical access and the ability to connect to the serial port can recover sensitive information, including the router’s management password and wireless network key.
Successful exploitation can lead to full administrative control of the device and unauthorized access to the associated wireless network.
Weakness: CWE-312
Which versions are affected by CVE-2026-4346?
It affects 1 product.
Products include Tp-Link Tl-Wr850n Firmware.
How do I fix CVE-2026-4346?
No fix has been published for CVE-2026-4346 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4346 being exploited?
There is no known exploitation of CVE-2026-4346 in the wild and no public exploit code.
Sources
Also known as GHSA-j2f5-7fm8-m5q7.