Root command execution via unescaped upload filename
Published Jul 12, 2026 · Updated Jul 12, 2026
OS command injection in COMFAST CF-WR631AX V3 2.7.0.0 through 2.7.0.8 allows remote attackers to execute commands via image uploads. The FastCGI system_wl_upload_pic_file handler in /usr/bin/webmgnt reads filename from a JSON POST body, inserts it into a shell command with sprintf(), and passes the result to system() without validation or escaping. Network access to the router management interface is required; LAN access suffices, WAN exposure depends on remote management, and successful commands run as root.
Summary
What happened
OS command injection in COMFAST CF-WR631AX V3 2.7.0.0 through 2.7.0.8 allows remote attackers to execute commands via image uploads. The FastCGI system_wl_upload_pic_file handler in /usr/bin/webmgnt reads filename from a JSON POST body, inserts it into a shell command with sprintf(), and passes the result to system() without validation or escaping. Network access to the router management interface is required; LAN access suffices, WAN exposure depends on remote management, and successful commands run as root.
The record
- CVE
- CVE-2026-15511
- Published
- Jul 12, 2026
- Updated
- Jul 12, 2026
- Vendor
- COMFAST
- Product
- CF-WR631AX V3
- Classifications
- CWE-77, CWE-78, T1059.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 12, 2026CVE publishedPublication date reported by the CVE source.
- Jul 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.7.0.0
- Affected versionversion=2.7.0.1
- Affected versionversion=2.7.0.2
- Affected versionversion=2.7.0.3
- Affected versionversion=2.7.0.4
- Affected versionversion=2.7.0.5
- Affected versionversion=2.7.0.6
- Affected versionversion=2.7.0.7
- Affected versionversion=2.7.0.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- luminarydawn CF-WR631AX V3 image-upload proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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