CVE-2026-13538 Wavlink WL-NU516U1-A POST Parameter wireless.cgi sub_401D68 command injection
Remote attackers can execute arbitrary commands via crafted POST parameters in the wireless configuration interface of Wavlink routers.
- 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-2026-13538?
CVE-2026-13538 is a medium-severity command injection vulnerability in Wavlink WL-NU516U1-A, published on 29 Jun 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-A M16U1_V240425. The affected element is the function sub_401D68 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. This manipulation of the argument SSID2G2/SSID5G2/AuthMethod2/WPAPSK12 causes command injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The affected component should be upgraded. 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-2026-13538?
How do I fix CVE-2026-13538?
No fix has been published for CVE-2026-13538 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-2026-13538 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13538 exists.
Sources
Also known as GHSA-ffh8-39gq-j894.