CVE-2026-9387 Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection
Remote attackers can execute arbitrary OS commands on Totolink A8000RU routers via the web management interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9387?
CVE-2026-9387 is a critical command injection vulnerability in Totolink A8000RU, published on 24 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument resetFlags results in os command injection. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-9387?
How do I fix CVE-2026-9387?
No fix has been published for CVE-2026-9387 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-2026-9387 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9387 exists.
Sources
Also known as GHSA-q68g-wg9j-v69v.