What is CVE-2026-4166?

CVE-2026-4166 is a low-severity vulnerability in Wavlink Wl-Nu516u1, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-03-16.

How severe is CVE-2026-4166?

Low severity. CVSS v3 base score is 3.5 out of 10.

RCE in Wavlink Wl-Nu516u1

CVE-2026-4166

A vulnerability was found in Wavlink WL-NU516U1 240425. The impacted element is the function sub_404F68 of the file /cgi-bin/login.cgi. The manipulation of the argument homepage/hostname results in cross site scripting. The attack can be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

Affected products

Wavlink Wl-nu516u1 — versions 240425

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (related)
cna@vuldb.com (exploit)

Frequently asked questions

What is CVE-2026-4166?: CVE-2026-4166 is a low-severity vulnerability in Wavlink Wl-Nu516u1, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-03-16.
How severe is CVE-2026-4166?: Low severity. CVSS v3 base score is 3.5 out of 10.