CVE-2026-4166Public exploitNetwork attack vector

Reflected XSS via unencoded login parameters

Published Mar 15, 2026 · Updated Mar 15, 2026

Reflected XSS in Wavlink WL-NU516U1 240425 allows remote authenticated users to execute script in a user's browser via a crafted login request. The login.cgi path for page=login passes homepage or hostname through sprintf into a response buffer, and sub_404F68 returns the values without output encoding. Valid device credentials and user interaction with the crafted response are required; execution is confined to the browser context of the management interface.

CVSS severity3.5
Low
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Wavlink WL-NU516U1 240425 allows remote authenticated users to execute script in a user's browser via a crafted login request. The login.cgi path for page=login passes homepage or hostname through sprintf into a response buffer, and sub_404F68 returns the values without output encoding. Valid device credentials and user interaction with the crafted response are required; execution is confined to the browser context of the management interface.

The record

CVE
CVE-2026-4166
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
Wavlink
Product
WL-NU516U1
Classifications
CWE-79, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=240425

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WL-NU516U1version=240425

Published CVSS scores

2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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