CVE-2026-7823 Totolink A8000RU cstecgi.cgi setAppFilterCfg os command injection
Remote attackers can execute arbitrary OS commands on Totolink A8000RU routers via the setAppFilterCfg function in cstecgi.cgi.
- 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-2026-7823?
CVE-2026-7823 is a critical command injection vulnerability in Totolink A8000RU, published on 5 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. Affected is the function setAppFilterCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument enable results in os command injection. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-7823?
How do I fix CVE-2026-7823?
No fix has been published for CVE-2026-7823 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-2026-7823 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7823 exists.
Sources
Also known as GHSA-fj3m-x359-crxj.