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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (11.9th 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/E:X/RL:O/RC:C.

Affected products

Wavlink Wl-wn579a3 — versions 220323

Weakness classification (CWE)

References

VDB-358196 | Wavlink WL-WN579A3 login.cgi sub_401F80 cross site scripting (vdb-entry, technical-description)
VDB-358196 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
Submit #785303 | Wavlink WL-WN579A3 V220323 Cross Site Scripting (third-party-advisory)
github.com/Litengzheng/vul_db/blob/main/WL-WN579A3/vul_16/README.md (broken-link)
dl.wavlink.com/firmware/RD/WINSTAR_WN579A3-A-2026-03-10-94f93d4-WO-mt7628-squas… (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.