CVE-2026-13560: Edimax EW-7478APC Command Injection Vulnerability

Technical summary

CVE-2026-13560 is an OS command injection vulnerability affecting the formAccept POST request handler in Edimax EW-7478APC firmware 1.04. The vulnerability exists in the /goform/formAccept endpoint, where insufficient input validation on the submit-url parameter allows an authenticated user to inject shell commands. The flaw maps to CWE-77 (Improper Neutralization of Special Elements used in a Command) and CWE-78 (Improper Neutralization of Special Elements used in an OS Command), indicating both direct command and OS-level injection risks. The network-accessible nature of the web interface means exploitation does not require physical access or user interaction beyond initial authentication.

Business impact

Organizations deploying Edimax EW-7478APC devices face potential compromise of network infrastructure. An insider or attacker with valid credentials—obtained through credential stuffing, weak passwords, or social engineering—can gain system-level command execution on the access point itself. This could lead to lateral network movement, traffic interception, persistent backdoor installation, or denial of service affecting enterprise or branch office connectivity. The impact scales with the criticality of network segments where these devices are deployed.

Affected systems

Edimax EW-7478APC running firmware version 1.04 is confirmed affected. Organizations should verify whether they operate this model and firmware version in their network inventory. The Edimax EW-7478APC is a dual-band wireless access point commonly used in small-to-medium business and enterprise branch deployments. Firmware version lineage and whether newer versions exist should be checked against current Edimax documentation.

Exploitability

The vulnerability is remotely exploitable by authenticated users. No special privileges or user interaction is required; only valid login credentials to the device's web interface. The CVSS 3.1 score of 6.3 (Medium) reflects the authentication barrier (PR:L) but acknowledges the direct network access (AV:N) and low attack complexity (AC:L). Public disclosure means exploitation techniques are likely documented in the wild, raising the practical exploitability from theoretical to probable if the device is exposed to untrusted internal users.

Remediation

Contact Edimax support to check for patched firmware versions beyond 1.04. The vendor reportedly did not respond to early disclosure, so patch availability is uncertain. Interim measures include: restricting web interface access to trusted administrative networks using firewall rules; enforcing strong, unique credentials on all access points; disabling remote management if not essential; and monitoring device logs for suspicious POST requests to /goform/formAccept. Network segmentation can limit the impact if a device is compromised.

Patch guidance

Verify whether Edimax has released a firmware update for the EW-7478APC beyond version 1.04. Check the official Edimax support website or contact their technical support for the latest firmware build number and security advisory. If no patch is available and the vendor remains unresponsive, consider whether the device should continue operating in sensitive network roles or be replaced with an alternative from a vendor providing active security support. Document the firmware version of all deployed EW-7478APC units to enable rapid deployment of patches once available.

Detection guidance

Monitor access point logs for POST requests to /goform/formAccept with unusual or suspicious submit-url parameter values, particularly those containing shell metacharacters (pipes, semicolons, backticks, $(), etc.). Enable access point web interface access logging if available. Search network flow data for administrative access to EW-7478APC devices from unexpected sources. Periodically audit which devices or users have login credentials to these devices. Consider deploying web application firewalls or intrusion detection systems capable of analyzing HTTP POST parameters to the device.

Why prioritize this

Although the CVSS score is Medium (6.3), the combination of public disclosure, vendor non-responsiveness, and network infrastructure criticality warrants prompt attention. Access points are trust boundaries; compromise can undermine network security for all downstream devices. Organizations should prioritize inventory, credential hardening, and access restrictions for these devices within 30 days, and actively monitor for patched firmware.

Risk score, explained

The CVSS 3.1 score of 6.3 (Medium) reflects: remote network access (AV:N) without special attack complexity (AC:L), low impact on confidentiality, integrity, and availability (C:L, I:L, A:L), but requiring low-level authentication (PR:L). The score does not account for public disclosure or vendor non-responsiveness, factors that elevate practical risk. Organizations should treat this as a higher priority than the raw CVSS suggests, particularly if EW-7478APC devices handle security-sensitive network functions.

Frequently asked questions