CVE-2026-89010

Critical

Description

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductWN535M1

PublishedSep 11, 2026

First seenSep 11, 2026

Weakness typeCWE-78OS command injection

How to fix

Patches

docs.wavlink.xyz/Security_Advisory/WAVLINK-SA-2026-091302/

Affected products

Product	Affected versions	Fixed in
WAVLINK Technology WN535M1	M35M1_V210223	—
WAVLINK Technology WN535M3	M35M1_V210223	—

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