Unauthenticated OS Command Injection in WAVLINK Routers
CVE-2026-89010

9.3CRITICAL

Key Information:

Vendor

Wavlink Technology

Status
Wn535m1
Wn535m3
Vendor
CVE Published:
11 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-89010?

WAVLINK WN535M1 and WN535M3 routers with firmware versions earlier than M35M1_V250922 are susceptible to an OS command injection vulnerability. This flaw allows attackers, without authentication, to execute arbitrary commands with root privileges by sending maliciously crafted filenames to the sync_server daemon listening on TCP port 13136. The sync_server improperly handles input that includes shell metacharacters, utilizing the unsafe sprintf() function to construct shell command strings before passing them to system(). This oversight opens a significant security breach, allowing remote exploitation of the affected devices.

Affected Version(s)

WN535M1 M35M1_V210223

WN535M3 M35M1_V210223

WN535M1 M35M1_V250922

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-89010 - Proof of Concept

References

https://github.com/camdsmith/wavlink-sync_server-rce/blob...
technical-descriptionexploit
https://docs.wavlink.xyz/
productpatch
https://www.vulncheck.com/advisories/wavlink-wn535m1-wn53...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Cameron Smith
.