CVE-2026-15511 Comfast CF-WR631AX V3 FastCGI Backend webmgnt system_wl_upload_pic_file os command injection
Remote attackers can execute arbitrary OS commands via the filename argument in the webmgnt FastCGI backend of Comfast CF-WR631AX V3 routers.
- 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-2026-15511?
CVE-2026-15511 is a critical command injection vulnerability in Comfast CF-WR631AX V3, published on 12 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was determined in Comfast CF-WR631AX V3 up to 2.7.0.8. Affected by this vulnerability is the function system_wl_upload_pic_file of the file /usr/bin/webmgnt of the component FastCGI Backend. This manipulation of the argument filename causes os command injection. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-15511?
How do I fix CVE-2026-15511?
No fix has been published for CVE-2026-15511 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-2026-15511 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15511 exists.
Sources
Also known as GHSA-hpmx-855m-f9m5.