CVE-2026-22877: Copeland Xweb 300d Pro File Read Flaw

CVE-2026-22877 Overview

An arbitrary file-read vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior firmware releases. This path traversal vulnerability (CWE-22) enables unauthenticated attackers to read arbitrary files on the system through network-based attacks, potentially exposing sensitive configuration data, credentials, and system information. The vulnerability may also be leveraged to cause a denial-of-service condition on affected industrial control system (ICS) devices.

Critical Impact

Unauthenticated remote attackers can read sensitive system files and potentially disrupt critical industrial refrigeration control systems without any user interaction required.

Affected Products

• Copeland XWEB 300D Pro Firmware (version 1.12.1 and prior)
• Copeland XWEB 500D Pro Firmware (version 1.12.1 and prior)
• Copeland XWEB 500B Pro Firmware (version 1.12.1 and prior)

Discovery Timeline

• February 27, 2026 - CVE-2026-22877 published to NVD
• February 27, 2026 - Last updated in NVD database

Technical Details for CVE-2026-22877

Vulnerability Analysis

This vulnerability represents a path traversal weakness that allows remote, unauthenticated attackers to access files outside of the intended directory structure on Copeland XWEB Pro devices. The XWEB Pro product line consists of industrial controllers used for refrigeration and HVAC system management in commercial and industrial environments.

The vulnerability requires no authentication and can be exploited remotely over the network without any user interaction. An attacker successfully exploiting this flaw gains the ability to read arbitrary files from the underlying filesystem, which could expose sensitive configuration files, authentication credentials, or proprietary operational data. Additionally, exploitation may result in denial-of-service conditions affecting the availability of the control system.

Root Cause

The root cause is improper input validation (CWE-22) in the web interface of XWEB Pro firmware. The application fails to properly sanitize user-supplied input containing directory traversal sequences such as ../ before using it to construct file paths. This allows attackers to escape the web application's intended directory and access files anywhere on the filesystem that the web server process has permissions to read.

Attack Vector

The attack is network-based and targets the web interface exposed by XWEB Pro devices. An attacker can craft malicious HTTP requests containing path traversal sequences to manipulate file path parameters. Since no authentication is required, any attacker with network access to the device's web interface can exploit this vulnerability.

The attack flow typically involves:

1. Identifying an exposed XWEB Pro web interface on the network
2. Crafting HTTP requests with path traversal sequences (e.g., ../../etc/passwd)
3. Receiving the contents of arbitrary files in the server response
4. Potentially causing service disruption through targeted file access operations

Detection Methods for CVE-2026-22877

Indicators of Compromise

• Unusual HTTP requests to XWEB Pro web interfaces containing path traversal patterns such as ../, ..%2f, or encoded variants
• Web server logs showing access to sensitive system files like /etc/passwd, /etc/shadow, or configuration files
• Increased error rates or unexpected file access patterns in application logs
• Denial-of-service symptoms on XWEB Pro controllers coinciding with suspicious network activity

Detection Strategies

• Deploy network intrusion detection systems (IDS) with rules to detect path traversal patterns in HTTP traffic directed at XWEB Pro devices
• Monitor web server access logs for requests containing directory traversal sequences or attempts to access system files
• Implement application-layer firewalls (WAF) to filter malicious path traversal attempts before they reach vulnerable devices
• Use network segmentation monitoring to detect unauthorized access attempts to OT/ICS network segments

Monitoring Recommendations

• Enable comprehensive logging on all XWEB Pro devices and forward logs to a centralized SIEM for correlation and analysis
• Configure alerts for any access attempts to sensitive file paths or unusual request patterns in web server logs
• Monitor network traffic between IT and OT segments for anomalous HTTP traffic patterns targeting industrial control devices
• Implement baseline monitoring of normal XWEB Pro communication patterns to identify deviations that may indicate exploitation attempts

How to Mitigate CVE-2026-22877

Immediate Actions Required

• Apply firmware updates from Copeland as soon as they become available via the Copeland System Software Update portal
• Isolate affected XWEB Pro devices on segmented networks with restricted access from untrusted zones
• Implement firewall rules to limit access to XWEB Pro web interfaces to only authorized management stations
• Review the CISA ICS Advisory ICSA-26-057-10 for vendor-specific guidance and updates

Patch Information

Copeland has released information regarding this vulnerability. Administrators should visit the Copeland System Software Update portal to obtain the latest firmware version that addresses CVE-2026-22877. Additional technical details are available in the CISA ICS Advisory and the GitHub CSAF resource.

Workarounds

• Place XWEB Pro devices behind a properly configured firewall that blocks access from untrusted networks
• Disable or restrict remote web interface access if not operationally required
• Use VPN connections for remote management of XWEB Pro controllers rather than exposing web interfaces directly
• Implement network segmentation to isolate industrial control systems from general corporate networks and the internet

# Example firewall configuration to restrict XWEB Pro web interface access
# Allow only specific management IPs to access the device
iptables -A INPUT -s 192.168.10.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -s 192.168.10.0/24 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP