TI-2026-30328 Aliases CVE-2026-41926 GHSA-r939-4h6w-w7j6

WDR201A WiFi Extender OS Command Injection via firewall.cgi

HIGH 81CWE-78Published 2026-05-04 · Updated 2026-05-18

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

WDR201A WiFi Extender (HW V2.1, FW LFMZX28040922V1.02) contains an OS command injection vulnerability in the firewall.cgi binary across five request handlers that apply insufficient input validation. Attackers can inject arbitrary shell commands through vulnerable parameters like websURLFilter, websHostFilter, portForward, singlePortForward, and ipportFilter using subshell syntax or unfiltered parameters, with payloads persisting in NVRAM and re-executing on every subsequent firewall.cgi request.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01235 69th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Shenzhen Yipu Commercial and Trading Co., Ltd	WDR201A WiFi Extender	up to 1.02.0	—	No fix listed	CNA

WDR201A WiFi Extender VendorShenzhen Yipu Commercial and Trading Co., Ltd Affected up to 1.02.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-41926
2026-10-03 Alias added: GHSA-r939-4h6w-w7j6

References

Exploit 1

https://mstreet97.github.io/security-research/iot/vulnerability-disclosure/ai-assisted-research/cybersecurity/cve/2026/05/04/Teaching_the_Machine_Where_to_Look.html

Other 1

https://www.made-in-china.com/showroom/yeapook/#:~:text=Established%20in%202015.%2CDistrict%2C%20Shenzhen%2C%20Guangdong%2C%20China

TI-2026-30327 WDR201A WiFi Extender OS Command Injection via adm.cgi (reboot_time) CVSS 4.0CRITICAL 9.3
TI-2026-30326 WDR201A WiFi Extender OS Command Injection via makeRequest.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30325 WDR201A WiFi Extender OS Command Injection via internet.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30324 WDR201A WiFi Extender OS Command Injection via wireless.cgi CVSS 4.0CRITICAL 9.3
TI-2026-30329 WDR201A WiFi Extender Stack-Based Buffer Overflow via firewall.cgi CVSS 4.0HIGH 8.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences