CVE-2026-89010: Wavlink Technology WN535M1

Critical severity, CVSS 9.8. EPSS: 3.2% chance of exploitation in the next 30 days.

WAVLINK WN535M1 and WN535M3 routers running firmware prior to M35M1_V250922 contain an unauthenticated OS command injection vulnerability that allows remote attackers to execute arbitrary commands as root by sending crafted filenames to the sync_server daemon on TCP port 13136. The daemon interpolates attacker-controlled filename input containing shell metacharacters into a shell command string via sprintf() and passes it to system() without sanitization, enabling root-level command execution on the device.

Affected products

Published 2026-09-11. Last modified 2026-09-11.