What is CVE-2026-6559?

CVE-2026-6559 is a medium-severity vulnerability in Wavlink Wl-Wn579a3, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-04-19.

How severe is CVE-2026-6559?

Medium severity. CVSS v3 base score is 4.3 out of 10.

RCE in Wavlink Wl-Wn579a3

CVE-2026-6559

A weakness has been identified in Wavlink WL-WN579A3 220323. This affects the function sub_401F80 of the file /cgi-bin/login.cgi. This manipulation of the argument Hostname causes cross site scripting. Remote exploitation of the attack is possible. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (18.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Wavlink Wl-wn579a3 — versions 220323

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 (broken-link)
cna@vuldb.com (patch)

Frequently asked questions

What is CVE-2026-6559?: CVE-2026-6559 is a medium-severity vulnerability in Wavlink Wl-Wn579a3, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-04-19.
How severe is CVE-2026-6559?: Medium severity. CVSS v3 base score is 4.3 out of 10.