Cross Site Scripting Vulnerability in Wavlink WL-NU516U1 Product
CVE-2026-4166

5.1MEDIUM

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
15 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4166?

A cross site scripting vulnerability exists in the Wavlink WL-NU516U1 240425 due to improper handling of user input in the login.cgi script. This flaw allows an attacker to manipulate the homepage or hostname parameters, executing arbitrary JavaScript in the context of the affected user's session. As the attack can be launched remotely, it poses a significant risk, allowing unauthorized actions on behalf of users who interact with the compromised system. The vendor has been notified of this issue, which has since been made publicly known.

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Affected Version(s)

WL-NU516U1 240425

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-2026-4166 - Proof of Concept

References

https://vuldb.com/?id.351073
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351073
signaturepermissions-required
https://vuldb.com/?submit.769652
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHust2 (VulDB User)
VulDB
JSON
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