Wavlink WL-WN530BE1-A suffers remote command injection in uploadVpn.cgi
A critical flaw in this device’s web interface allows remote OS command injection, according to NVD records.
Key points
- The vulnerability is tracked as CVE-2026-109108 with a CVSS score of 9.4.
- It affects the uploadVpn.cgi script via manipulation of the Type argument.
- The vendor was contacted early regarding this public disclosure.
The Wavlink WL-WN530BE1-A device contains a critical security flaw. The National Vulnerability Database records this issue as CVE-2026-109108. It allows remote attackers to execute arbitrary operating system commands. The bug resides in the web server’s CGI handling logic.
Root cause
The issue stems from improper input sanitisation in a specific web script. The file /cgi-bin/uploadVpn.cgi processes user-supplied data without adequate validation. Specifically, the application calls the popen function with unsanitised data. This design choice maps to CWE-78 and CWE-77 weaknesses. Attackers can inject shell commands through this pathway.
Attack path
An adversary can trigger the flaw from a remote location. They target the Type argument within the HTTP request. By manipulating this parameter, they inject malicious operating system commands. The server executes these commands directly. The exploit code has been disclosed publicly. This makes the technique available for immediate use by attackers.
Affected versions
Only one specific firmware build is listed as affected. Users of the Wavlink WL-WN530BE1-A must check their software version. The vulnerable release is identified as version 251117. No other versions are mentioned in the advisory. Confirmation of impact on other builds is absent from the current records.
Mitigation
No software patch has been confirmed by the vendor yet. The advisory notes that the vendor was contacted early about the disclosure. Until a fix is released, users should isolate the device. Disabling remote management features may reduce exposure. Monitoring network traffic for anomalies is also advisable.
What to do and how to stay safe: Wavlink
- Check the firmware version of your Wavlink device to see if it matches 251117.
- Restrict network access to the device’s web interface from untrusted zones.
- Monitor system logs for unusual command execution or process spawning.
- Isolate the device from the main network until a vendor update is available.
Step-by-step guide: Out-of-band patches: what small businesses need to know
General security guidance from the Firewall Pulse newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVSS score for this vulnerability?
The National Vulnerability Database assigns a CVSS score of 9.4, rated as critical.
Which specific file is vulnerable?
The vulnerability affects the /cgi-bin/uploadVpn.cgi file within the device’s firmware.
Is there a fix available?
No fix has been confirmed yet, though the vendor was contacted early.
