CVE-2026-5339 Tenda G103 Setting gpon.lua action_set_net_settings command injection
Remote attackers can execute arbitrary commands on Tenda G103 routers by manipulating specific authentication parameters in the setting handler.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5339?
CVE-2026-5339 is a medium-severity command injection vulnerability in Tenda G103, published on 2 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.
Which versions are affected by CVE-2026-5339?
It affects 1 product.
Products include Tenda G103 Firmware.
How do I fix CVE-2026-5339?
No fix has been published for CVE-2026-5339 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-2026-5339 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5339 exists.
Other vulnerabilities in Tenda G103
Sources
Also known as GHSA-7g3h-f8vq-89vv.