CVE-2026-18590 Wavlink WL-NU516U1 Admin Password adm.cgi set_sys_adm os command injection
Remote attackers can execute arbitrary OS commands via the admin password handler in Wavlink WL-NU516U1 routers, requiring an upgrade to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18590?
CVE-2026-18590 is a medium-severity command injection vulnerability in Wavlink WL-NU516U1, published on 3 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Wavlink WL-NU516U1 708c073-mt7628. Affected is the function set_sys_adm of the file adm.cgi of the component Admin Password Handler. This manipulation causes os command injection. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. It is suggested to upgrade the affected component. 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-2026-18590?
How do I fix CVE-2026-18590?
No fix has been published for CVE-2026-18590 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-18590 being exploited?
There is no known exploitation of CVE-2026-18590 in the wild and no public exploit code.
Sources
Also known as GHSA-29gr-cg9c-hpx3.