CVE-2026-4166: Wavlink WL-NU516U1 login.cgi sub_404F68 cross site scripting

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-16 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

Wavlink NU516U1: 240425

References

https://github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_14/README.md
https://github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_15/README.md
https://vuldb.com/?ctiid.351073
https://vuldb.com/?id.351073
https://vuldb.com/?submit.769652
https://vuldb.com/?submit.769653

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