Comfast CF-WR631AX V3 up to 2.7.0.8 FastCGI Backend /usr/bin/webmgnt system_wl_upload_pic_file filename os command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Comfast CF-WR631AX V3 up to 2.7.0.8. Affected by this issue is the function system_wl_upload_pic_file of the file /usr/bin/webmgnt of the component FastCGI Backend. Such manipulation of the argument filename leads to os command injection. This vulnerability is referenced as CVE-2026-15511. It is possible to launch the attack remotely. Furthermore, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Comfast CF-WR631AX V3 up to 2.7.0.8. Affected by this issue is the function system_wl_upload_pic_file of the file /usr/bin/webmgnt of the component FastCGI Backend. The manipulation of the argument filename with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-15511. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1202.

The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Comfast

Name

• CF-WR631AX V3

Version

• 2.7.0.0
• 2.7.0.1
• 2.7.0.2
• 2.7.0.3
• 2.7.0.4
• 2.7.0.5
• 2.7.0.6
• 2.7.0.7
• 2.7.0.8

CPE 2.3info

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CPE 2.2info

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Submitinfo

Accepted

• Submit #846719: Comfast (Shenzhen Four Seas Global Link Network Technology Co., CF-WR631AX V3 V2.7.0.8 OS Command Injection (by luminarydawn)

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