CVE-2026-13560: Edimax EW-7478APC RCE Vulnerability

CVE-2026-13560 Overview

CVE-2026-13560 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 formAccept function within /goform/formAccept, part of the device's POST Request Handler component. An authenticated attacker can manipulate the submit-url argument to inject arbitrary shell commands that execute on the device.

The issue is tracked under CWE-77 (Improper Neutralization of Special Elements used in a Command). The exploit has been publicly disclosed and the vendor did not respond to disclosure attempts.

Critical Impact
Remote authenticated attackers can execute arbitrary OS commands on the underlying device, enabling persistence, network pivoting, and manipulation of network traffic passing through the access point.

Affected Products

Edimax EW-7478APC wireless access point
Firmware version 1.04
The /goform/formAccept POST Request Handler endpoint

Discovery Timeline

2026-06-29 - CVE-2026-13560 published to NVD
2026-06-30 - Last updated in NVD database

Technical Details for CVE-2026-13560

Vulnerability Analysis

The formAccept handler in /goform/formAccept accepts a submit-url parameter through HTTP POST requests. The handler passes this parameter value into a system shell invocation without sanitizing shell metacharacters. Attackers who append characters such as ;, |, &, or backticks to submit-url can break out of the intended argument context and execute additional commands.

Because the web management daemon on embedded access points typically runs as root, injected commands inherit full privileges over the device firmware, configuration, and network interfaces. This exposure allows attackers to modify DNS settings, capture client traffic, deploy persistent implants, or use the device as a pivot into the internal network.

The attack requires network access to the device's management interface and low-level authentication. According to the disclosure, the exploit has been made public but no confirmed weaponized in-the-wild activity has been reported.

Root Cause

The root cause is missing input neutralization on the submit-url parameter before its value is concatenated into a shell command string. The handler does not enforce an allowlist of characters, does not use safe process-execution APIs, and does not quote or escape user-controlled input. This maps directly to CWE-77.

Attack Vector

An attacker sends a crafted HTTP POST request to /goform/formAccept on the device's administrative web interface. The request includes a submit-url value containing shell metacharacters followed by attacker-chosen commands. The web daemon parses the request, invokes a shell, and executes the injected commands. Because the interface is reachable over the network, an attacker on the same LAN or one who has exposed management access to the internet can trigger the vulnerability remotely.

No verified proof-of-concept code is available. Technical details are documented in the EDIMAX EW-7478APC formAccept report and the VulDB entry for CVE-2026-13560.

Detection Methods for CVE-2026-13560

Indicators of Compromise

HTTP POST requests to /goform/formAccept containing shell metacharacters (;, |, &, `, $() in the submit-url parameter.
Unexpected outbound connections originating from the access point management IP, particularly to unknown external hosts.
Modified device configuration, unexpected new administrative users, or altered DNS server entries on the affected Edimax device.

Detection Strategies

Inspect web server and access logs on the device (or from an upstream logging proxy) for POST requests to /goform/formAccept with non-URL characters in submit-url.
Deploy network intrusion identification signatures that flag HTTP POST bodies to Edimax management endpoints containing common command-injection payloads such as ;wget, |sh, or $(id).
Baseline expected outbound traffic from network infrastructure devices and alert on deviations, especially TCP connections initiated by access points to non-management destinations.

Monitoring Recommendations

Restrict access to the device's management interface to a dedicated management VLAN and monitor that segment for unauthorized POST traffic.
Forward device syslog and administrative interface logs to a centralized log platform for retention and correlation with endpoint and firewall telemetry.
Include the Edimax EW-7478APC in periodic authenticated vulnerability scans to identify unpatched firmware versions.

How to Mitigate CVE-2026-13560

Immediate Actions Required

Remove the Edimax EW-7478APC management interface from any untrusted or internet-facing network and restrict it to a dedicated management subnet.
Change default and shared administrative credentials on the affected devices, since exploitation requires low-privilege authentication.
Disable remote HTTP management on the device and require access through a VPN or jump host.
Inventory all Edimax EW-7478APC units running firmware 1.04 and prioritize replacement or isolation.

Patch Information

The vendor did not respond to the disclosure and no official patch has been referenced in the advisory. Organizations should monitor the Edimax support portal for firmware updates and consult the VulDB vulnerability record #374568 for revision information as it becomes available.

Workarounds

Block external access to /goform/formAccept at an upstream firewall or reverse proxy until a vendor fix is available.
Replace the affected access point with a supported model if the vendor does not issue a firmware update.
Enforce network segmentation so that a compromised access point cannot reach sensitive internal systems or identity infrastructure.

bash

# Example upstream firewall rule (iptables) to block POST requests
# to the vulnerable endpoint from untrusted networks. Adjust the
# management subnet and device IP for your environment.
iptables -A FORWARD -p tcp -d 192.0.2.10 --dport 80 \
  -m string --string "/goform/formAccept" --algo bm -j DROP
iptables -A FORWARD -p tcp -d 192.0.2.10 --dport 443 \
  -m string --string "/goform/formAccept" --algo bm -j DROP