CVE-2026-2533: Php

Security Advisory: Critical Command Injection Vulnerability in Tosei Self-Service Washing Machine Software

Overview

A critical security flaw has been identified in the network-connected software of Tosei Self-service Washing Machines, version 4.02. This vulnerability allows a remote attacker to execute arbitrary commands on the affected device. The issue is currently being actively exploited, and the software vendor has not provided a patch or official response.

Vulnerability Details

The vulnerability exists in a specific component (/cgi-bin/tosei_datasend.php) of the machine’s web interface. This component improperly processes user input. By sending a specially crafted network request containing malicious commands in a specific parameter (adr_txt_1), an attacker can “trick” the washing machine’s system into running those commands. This is known as a remote command injection attack.

In simple terms, a feature meant to accept normal text data can be abused to send operating system instructions instead.

Impact Assessment

This is a high-severity vulnerability (CVSS Score: 7.3) with significant consequences:

• Remote Code Execution: An attacker anywhere on the internet could gain full control over the washing machine’s underlying operating system.
• Network Compromise: The compromised device could be used as a foothold to attack other devices on the same local network.
• Service Disruption: Attackers could stop the washing machines from functioning, causing operational and financial impact for laundry service providers.
• Data Theft & Manipulation: Sensitive data on the device, including usage logs or potentially payment information, could be accessed or altered.

Affected Products

• Product: Tosei Self-service Washing Machines
• Affected Version: Firmware version 4.02. Other versions may also be vulnerable and should be investigated.

Remediation and Mitigation Steps

As the vendor has not released a patch, immediate mitigation is essential.

Primary Action: Network Isolation

1. Segment the Network: Immediately isolate all affected Tosei washing machines on a dedicated, firewalled network segment. They should not have direct internet access or be on the same network as critical business systems (e.g., point-of-sale, corporate servers).
2. Restrict Access: Use a firewall to block all inbound internet traffic to the washing machines. If remote management is required, restrict access via a VPN and strong authentication.

Secondary Actions:

• Monitor for Updates: Continuously check with Tosei or your equipment supplier for an official firmware update or security advisory.
• Assess Exposure: Review network logs for any unusual connection attempts to the affected devices, particularly targeting the /cgi-bin/tosei_datasend.php file.
• Contact Your Vendor: Reach out to your laundry equipment provider to pressure the manufacturer for a resolution and to inquire about potential upgrade paths to a secure version.

Important Note: Do not rely on the washing machine’s built-in web interface for security. Assume it is vulnerable until a vendor-verified patch is applied. The cornerstone of your defense must be strict network containment.