CVE-2026-26357 is a Cross-site Scripting (XSS) vulnerability classified under CWE-79 found in Dell Unisphere for PowerMax version 9.2.4.x. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject malicious HTML or JavaScript code into the web interface. This flaw can be exploited remotely by an attacker with low privileges who has access to the web application, requiring user interaction to trigger the malicious payload. Once exploited, the attacker’s code executes in the context of the victim’s browser session, potentially leading to theft of session tokens, unauthorized information disclosure, or client-side request forgery attacks. The vulnerability affects the confidentiality and integrity of the system but does not impact availability. The CVSS v3.1 base score is 5.4, reflecting medium severity with network attack vector, low attack complexity, requiring privileges and user interaction, and scope change due to the impact on other users. No patches or known exploits are currently publicly available, but the vulnerability is published and should be addressed promptly. The affected product, Dell Unisphere for PowerMax, is a management interface for Dell EMC PowerMax storage arrays, widely used in enterprise data centers for critical storage operations.

For European organizations, exploitation of this XSS vulnerability could lead to unauthorized access to sensitive information managed via Dell Unisphere for PowerMax, including session hijacking and data leakage. This can compromise the confidentiality and integrity of storage management operations, potentially exposing critical infrastructure data or enabling further lateral attacks within enterprise networks. Given the role of PowerMax in high-performance storage environments, disruption or compromise could affect business continuity indirectly by undermining trust in storage management interfaces. Organizations in sectors such as finance, telecommunications, government, and large enterprises relying on Dell EMC storage solutions are at higher risk. The medium severity indicates that while immediate system availability is not threatened, the potential for data compromise and unauthorized actions through client-side attacks is significant. The requirement for low privileges and user interaction lowers the barrier for exploitation, especially in environments where multiple administrators or users access the management console.

To mitigate CVE-2026-26357, organizations should implement the following specific measures: 1) Apply any available patches or updates from Dell as soon as they are released to address this vulnerability. 2) If patches are not yet available, restrict access to the Unisphere for PowerMax web interface to trusted networks and users only, using network segmentation and firewall rules. 3) Enforce strict input validation and output encoding on all user-supplied data within the web application, if customization or additional controls are possible. 4) Limit user privileges to the minimum necessary, reducing the risk posed by low-privileged attackers. 5) Educate users and administrators about the risks of clicking on untrusted links or executing unknown scripts within the management console context. 6) Monitor web application logs and network traffic for suspicious activity indicative of attempted XSS exploitation. 7) Consider deploying web application firewalls (WAFs) with rules tuned to detect and block XSS payloads targeting the Unisphere interface. 8) Regularly review and audit user sessions and authentication logs to detect anomalies that may indicate session hijacking attempts.