CVE-2026-6559 Wavlink WL-WN579A3 login.cgi sub_401F80 cross site scripting
Remote attackers can execute arbitrary scripts via the Hostname parameter in the login interface of Wavlink WL-WN579A3 routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-6559?
CVE-2026-6559 is a medium-severity cross-site scripting vulnerability in Wavlink WL-WN579A3, published on 19 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-6559?
How do I fix CVE-2026-6559?
No fix has been published for CVE-2026-6559 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6559 being exploited?
There is no known exploitation of CVE-2026-6559 in the wild and no public exploit code.
Sources
Also known as GHSA-x8cm-r99c-gv26.