CVE-2026-13581 Overview
CVE-2026-13581 is an operating system (OS) command injection vulnerability affecting the Edimax EW-7478APC wireless access point running firmware version 1.04. The flaw resides in the formStaDrvSetup function handling POST requests to /goform/formStaDrvSetup. Attackers manipulate the rootAPmac argument to inject arbitrary shell commands into the underlying operating system. The issue is classified under [CWE-77] and can be triggered over the network. Public exploit details are available, and the vendor did not respond to disclosure attempts.
Critical Impact
Authenticated remote attackers can inject OS commands through the rootAPmac parameter, gaining code execution on affected Edimax EW-7478APC devices.
Affected Products
- Edimax EW-7478APC wireless access point
- Firmware version 1.04
- /goform/formStaDrvSetup POST request handler component
Discovery Timeline
- 2026-06-29 - CVE-2026-13581 published to NVD
- 2026-06-30 - Last updated in NVD database
Technical Details for CVE-2026-13581
Vulnerability Analysis
The vulnerability exists in the formStaDrvSetup handler within the device's embedded web server. The handler processes POST requests submitted to /goform/formStaDrvSetup and accepts a rootAPmac parameter. The parameter value is passed to a system-level command execution routine without sufficient input sanitization or validation. Attackers append shell metacharacters to rootAPmac to break out of the intended command context and execute arbitrary commands with the privileges of the web server process, which typically runs as root on embedded network devices.
Because the vulnerable endpoint is exposed on the device management interface, exploitation can occur across the network. The publicly available exploit lowers the barrier for opportunistic attackers targeting exposed Edimax access points.
Root Cause
The root cause is improper neutralization of special elements used in an OS command [CWE-77]. The formStaDrvSetup function concatenates the user-controlled rootAPmac value into a shell command string without escaping or allow-list validation. Shell metacharacters such as ;, |, &, and backticks pass through unchanged and are interpreted by the shell during command execution.
Attack Vector
An attacker sends a crafted HTTP POST request to /goform/formStaDrvSetup with a malicious rootAPmac value containing embedded shell commands. The request requires low-privilege authenticated access to the management interface. On successful exploitation, injected commands execute in the context of the device firmware, enabling configuration tampering, credential extraction, persistence, or use of the device as a network pivot.
Detailed technical write-ups are available through the VulDB CVE-2026-13581 entry and the Edimax EW-7478APC formStaDrvSetup analysis.
Detection Methods for CVE-2026-13581
Indicators of Compromise
- HTTP POST requests to /goform/formStaDrvSetup containing shell metacharacters (;, |, &, `, $() in the rootAPmac field.
- Outbound connections initiated by the access point to unfamiliar external hosts shortly after receiving management traffic.
- Unexpected configuration changes, new administrative accounts, or altered firmware behavior on the EW-7478APC.
Detection Strategies
- Inspect web application firewall or network intrusion detection logs for requests targeting /goform/formStaDrvSetup with non-MAC-formatted rootAPmac values.
- Deploy signatures that match shell metacharacters in POST bodies destined for Edimax management interfaces.
- Correlate authentication events on the device management portal with subsequent anomalous POSTs to formStaDrvSetup.
Monitoring Recommendations
- Restrict and log all administrative HTTP traffic to Edimax access points at the network perimeter.
- Alert on new outbound sessions from access point management IPs, which normally do not initiate external connections.
- Monitor for repeated failed and successful logins to the device followed by POSTs to /goform/ endpoints.
How to Mitigate CVE-2026-13581
Immediate Actions Required
- Remove Edimax EW-7478APC management interfaces from untrusted networks and disable remote administration.
- Rotate all administrative credentials on affected devices, since low-privilege authenticated access enables exploitation.
- Segment access points onto a dedicated management VLAN with strict access control lists.
Patch Information
No vendor patch is available. The vendor was contacted regarding this disclosure but did not respond. Organizations operating the Edimax EW-7478APC 1.04 should treat the device as unpatched and plan for replacement or compensating controls. Refer to the VulDB advisory for updates.
Workarounds
- Restrict access to the device management interface using firewall rules that only permit trusted administrative hosts.
- Disable the WAN-side management interface and require VPN access for configuration changes.
- Replace the affected access point with a supported model from a vendor that provides active firmware maintenance where feasible.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
