by Kastro
Paper/Archive/CVE-2026-41926

CVE-2026-41926

Shenzhen Yipu Commercial and Trading Co., Ltd WDR201A WiFi Extender — WDR201A WiFi Extender OS Command Injection via firewall.cgi

EPSS 1%public exploitCVSS 9.3
critical.is priorityof 100
52
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 69.1.691 × 2013.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
WDR201A WiFi Extender≤ 1.02.0–CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitmstreet97.github.io/security-research/iot/vulnerability-disclosure/ai-assisted-research/cybersecurity/cve/2026/05/04/Teaching_the_Machine_Where_to_Look.htmlrefmade-in-china.com/showroom/yeapook/#:~:text=Established%20in%202015.%2CDistrict%2C%20Shenzhen%2C%20Guangdong%2C%20Chinawriteupvulncheck.com/advisories/wdr201a-wifi-extender-os-command-injection-via-firewall-cgi