CVE-2026-6559: Wavlink WL-WN579A3 login.cgi sub_401F80 cross site scripting

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-19 · updated 2026-10-26
Weakness: CWE-79

Description

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.

Affected products

Wavlink WL-WN579A3: 220323

References

https://dl.wavlink.com/firmware/RD/WINSTAR_WN579A3-A-2026-03-10-94f93d4-WO-mt7628-squashfs-sysupgrade.bin
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579A3/vul_16/README.md
https://vuldb.com/submit/785303
https://vuldb.com/vuln/358196
https://vuldb.com/vuln/358196/cti

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