Vulnerability · Published Sep 11, 2026 · Assigned by VulnCheck

CVE-2026-89010WAVLINK WN535M1/WN535M3 Unauthenticated OS Command Injection via sync_server

Critical 9.8

In plain English

A critical-severity OS command injection in WN535M1 from WAVLINK Technology. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 3.2% (higher than 88% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)3.2%top 11.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
WAVLINK Technology	WN535M1	M35M1_V210223
WAVLINK Technology	WN535M3	M35M1_V210223

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Researcher Disclosure technical-description, exploit
WAVLINK Advisory patch, vendor-advisory
https://www.vulncheck.com/advisories/wavlink-wn535m1-wn535m3-unauthenticated-os-command-injection-via-sync-server third-party-advisory