Is CVE-2026-15511 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-15511 being exploited in the wild.

How severe is CVE-2026-15511?

Critical severity, with a CVSS score of 9.8, published 12 July 2026.

Which products and versions are affected?

Comfast CF-WR631AX V3 2.7.0.0 to 2.7.0.8.

Is there a fix for CVE-2026-15511?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-15511 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-15511?

Check whether you run Comfast CF-WR631AX V3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-15511: Comfast CF-WR631AX V3 command injection in FastCGI Backend

CVE-2026-15511 · Severity: critical · CVSS 9.8 · Published 2026-07-12

A vulnerability exists in the Comfast CF-WR631AX V3 wireless router, a device used to provide high-speed Wi-Fi connectivity. An attacker can remotely take full control of the router by sending a specially crafted file upload request. This could lead to the theft of sensitive data, interception of network traffic, or a complete shutdown of the internet service.

Vendors: Comfast.

Quick answers

Is CVE-2026-15511 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-15511 being exploited in the wild.
How severe is CVE-2026-15511?: Critical severity, with a CVSS score of 9.8, published 12 July 2026.
Which products and versions are affected?: Comfast CF-WR631AX V3 2.7.0.0 to 2.7.0.8.
Is there a fix for CVE-2026-15511?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-15511 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-15511?: Check whether you run Comfast CF-WR631AX V3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An OS command injection vulnerability exists in the Comfast CF-WR631AX V3 router (firmware versions up to 2.7.0.8). The flaw is located within the 'system_wl_upload_pic_file' function of the '/usr/bin/webmgnt' binary, which serves as the FastCGI Backend. By manipulating the 'filename' argument during a WiFi portal image upload, a remote attacker can execute arbitrary system commands without authentication. This occurs due to improper neutralization of special elements used in an OS command (CWE-78). As of the advisory date, the vendor has not responded to disclosure attempts, and no patch is currently available.

Affected products

Comfast CF-WR631AX V3 2.7.0.0 to 2.7.0.8

Timeline

2026-07-12: disclosed: Public disclosure of the vulnerability and exploit details.
2026-07-12: advisory

References

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