CVE-2026-18243 in DesignJet
Summary
by MITRE • 08/03/2026
Certain HP DesignJet products may be potentially vulnerable to cross-site scripting (XSS), which may allow unauthenticated HTTP requests to view print job previews.
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Analysis
by VulDB Data Team • 08/03/2026
Cross-site scripting vulnerabilities in HP DesignJet products represent a significant security risk that could enable attackers to execute malicious scripts within the context of affected web applications. These devices typically expose web interfaces for configuration and monitoring purposes, creating potential attack surfaces where improperly sanitized user input could be exploited. The vulnerability specifically allows unauthenticated HTTP requests to access print job previews, which may contain sensitive information or provide insights into document processing workflows.
The technical flaw stems from inadequate input validation and output encoding within the web application components of these multifunction devices. When users interact with the device's web interface, particularly when viewing print jobs or submitting documents, the system fails to properly sanitize data received from HTTP requests. This weakness creates opportunities for attackers to inject malicious scripts that can execute in the browser context of legitimate users who access the device's interface. The lack of authentication requirements for accessing print job previews suggests insufficient access control mechanisms are implemented.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could enable more sophisticated attacks such as session hijacking or data exfiltration. An attacker with access to the network segment containing these devices could potentially harvest sensitive documents, monitor printing activities, or even manipulate print job configurations. The unauthenticated nature of the attack means that attackers do not need valid credentials to exploit this weakness, making it particularly dangerous in environments where physical security is not strictly enforced.
Organizations should implement immediate mitigations including network segmentation to isolate these devices from critical systems and untrusted networks. Regular firmware updates from HP should be applied promptly to address known vulnerabilities, though the specific nature of these designjet products may require additional configuration adjustments. Network monitoring solutions should be configured to detect unusual patterns in web traffic directed toward these devices, particularly around print job preview requests. The vulnerability aligns with CWE-79 Cross-site Scripting and follows ATT&CK technique T1059.005 for script execution, emphasizing the need for comprehensive input validation across all user-facing interfaces.
Security professionals should also consider implementing web application firewalls specifically configured to block suspicious patterns in HTTP requests targeting these devices. The vulnerability demonstrates the importance of secure coding practices in embedded systems and highlights how seemingly simple web interfaces can become attack vectors when proper security controls are not implemented. Device administrators should regularly audit access controls and review network configurations to ensure that only authorized personnel have access to print job previews and related functionalities.