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A critical vulnerability exists in Copeland XWEB Pro versions 1.12.1 and prior, stemming from improper handling of unexpected return values during the authentication process . The software’s authentication routine, when presented with certain malformed or unexpected requests, returns a non-standard status code or value . Instead of rejecting this anomalous result, the subsequent logic in the application incorrectly processes it as a legitimate, successful authentication token . This flaw, categorized as CWE-394 (Unexpected Status Code or Return Value), allows an unauthenticated attacker to bypass the login mechanism entirely by triggering this error condition and leveraging the improperly handled return value to gain access to the application’s interface . The vulnerability is exploitable remotely over the network without requiring any user interaction or prior privileges, and while it grants high confidentiality impact, the integrity and availability impacts are rated as low .
Platform: XWEB Pro
Version: <=1.12.1
Vulnerability : Authentication Bypass
Severity: High
date: 02/26/2026
Prediction: Patched version.
What Undercode Say:
Analysis:
The core issue is a logic flaw in the authentication state machine, not a memory corruption bug . It falls under CWE-394, meaning the software fails to check the return value from a function properly . The exploit requires network access to the device’s web interface. Given the high CVSS score (8.6) and the critical role of these devices in commercial facilities, this poses a significant risk for targeted attacks .
Bash Commands:
Check if the target is running the vulnerable XWEB Pro version
(Requires nmap with service detection)
nmap -p 80,443 --script http- <target_IP>
Attempt a simple curl command to trigger the unexpected return value
(This is a conceptual example, actual exploitation may vary)
curl -i -X POST http://<target_IP>/login \
-H "Content-Type: application/json" \
-d '{"username": "invalid", "password": "invalid", "auth_type": "malformed"}'
Monitor logs for authentication failures or unexpected return codes
sudo tail -f /var/log/syslog | grep -i "xweb|auth"
Exploit:
An attacker crafts a specific HTTP request to the login endpoint containing malformed data, such as an unexpected data type or an out-of-range value in an authentication field . The server’s authentication function processes this input and, unable to validate it, returns an error code (e.g., -1 or a null pointer). The main application, failing to verify that the return value indicates failure, treats this error code as a valid session token or success flag, granting the attacker access to the authenticated areas of the web application .
Protection:
- Update Immediately: Upgrade to the latest version of XWEB Pro provided by Copeland via the official software update page .
- Network Segmentation: Isolate the XWEB Pro devices on a separate VLAN, restricting access to trusted administrative networks only .
- Input Validation: If patches cannot be applied immediately, implement a web application firewall (WAF) rule to inspect and block requests with malformed authentication parameters .
Impact:
Successful exploitation allows an unauthenticated attacker to gain unauthorized access to the XWEB Pro interface . This can lead to unauthorized viewing of sensitive system data and configuration settings . While this specific CVE does not directly allow code execution, bypassing authentication is the first step to chaining this vulnerability with other flaws (like the multiple OS command injection CVEs also disclosed for this product) to achieve full system compromise .
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Sources:
Reported By: nvd.nist.gov
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