What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-29
• Weakness: CWE-78

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

• WAVLINK Technology WN535M1: M35M1_V210223
• WAVLINK Technology WN535M3: M35M1_V210223

References

• https://docs.wavlink.xyz/Security_Advisory/WAVLINK-SA-2026-091302/
• https://github.com/camdsmith/wavlink-sync_server-rce/blob/main/README.md
• https://www.vulncheck.com/advisories/wavlink-wn535m1-wn535m3-unauthenticated-os-command-injection-via-sync-server

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