CVE-2026-6837 Command injection in WAX650S firmware
An authenticated administrator can execute arbitrary OS commands on Zyxel WAX650S devices via the export-cgi program.
- 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-2026-6837?
CVE-2026-6837 is a high-severity command injection vulnerability in Zyxel WAX650S firmware, published on 4 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A post-authentication command injection vulnerability in the "export-cgi" CGI program in Zyxel WAX650S firmware versions through 7.10(ABRM.4)C0 could allow an authenticated attacker with administrator privileges to execute OS commands on an affected device.
Weakness: CWE-78
Which versions are affected by CVE-2026-6837?
How do I fix CVE-2026-6837?
No fix has been published for CVE-2026-6837 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-2026-6837 being exploited?
There is no known exploitation of CVE-2026-6837 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-fq66-x242-gfpv.