OS Command Injection Vulnerability in WAVLINK WN553X1-B Router
CVE-2026-120238

9.4CRITICAL

Key Information:

Vendor

Wavlink

Status
Wn553x1-b
Vendor
CVE Published:
1 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120238?

A remote exploitation vulnerability has been identified in the WAVLINK WN553X1-B router, specifically affecting version 260403_2.0.0. This security flaw exists within the 'ovpn_file' handler, particularly in the 'sub_4162A8' function, where improper handling of the 'file_id' argument allows for OS command injection. An attacker can exploit this weakness remotely to execute arbitrary commands on the affected device. The vendor has been informed about this vulnerability ahead of public disclosure.

Affected Version(s)

WN553X1-B 260403_2.0.0

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-2026-120238 - Proof of Concept

References

https://vuldb.com/vuln/429597
vdb-entrytechnical-description
https://vuldb.com/vuln/429597/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120238
third-party-advisory

CVSS V4

Score:
9.4
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

shuyi (VulDB User)
VulDB CNA Team
.