Remote Authentication Bypass in WAVLINK WN536AX6-A VPN Client
CVE-2026-120278

6.9MEDIUM

Key Information:

Vendor

Wavlink

Status
Wn536ax6-a
Vendor
CVE Published:
1 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120278?

A vulnerability in the WAVLINK WN536AX6-A router exposes the VPN Client List Handler due to an argument manipulation issue within the function located in the /bin/ioos file. This results in missing authentication checks, allowing an attacker to execute remote exploits. The vulnerability is publicly known, and active threats may leverage it to compromise devices. WAVLINK was previously notified about the issue.

Affected Version(s)

WN536AX6-A V260507_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-2026-120278 - Proof of Concept

References

https://vuldb.com/vuln/429622
vdb-entrytechnical-description
https://vuldb.com/vuln/429622/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120278
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
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
.