CVE-2025-64392 in Backup Enterprise Manager
Summary
by MITRE • 10/07/2026
This vulnerability in Veeam Backup Enterprise Manager allows an attacker to execute script in the browser of a portal user who opens a crafted link.
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Analysis
by VulDB Data Team • 10/07/2026
The identified security flaw resides within the Veeam Backup Enterprise Manager application, specifically affecting its web-based management interface. This vulnerability is classified as a Cross-Site Scripting (XSS) issue, which falls under the Common Weakness Enumeration category CWE-79: Improper Neutralization of Input During Web Page Generation. The core technical deficiency lies in the insufficient validation and sanitization of user-supplied input or URL parameters processed by the application's backend before rendering them to the client-side browser. When a portal user interacts with a specially crafted hyperlink, the malicious payload embedded within that link is transmitted to the server and subsequently reflected or stored in the response without proper encoding. This allows arbitrary JavaScript code to be injected into the context of the trusted Veeam Backup Enterprise Manager domain.
From an operational perspective, this vulnerability poses significant risks to both individual users and the broader infrastructure managed by the backup solution. An attacker can exploit this flaw through social engineering tactics, such as sending a deceptive email or instant message containing the malicious link. Once a privileged administrator or any authenticated user clicks the link, the injected script executes within their browser session with the same privileges as legitimate application scripts. This enables the attacker to perform actions on behalf of the victim, including stealing sensitive authentication cookies, session tokens, and multi-factor authentication bypass codes. Furthermore, the attacker can manipulate the page content, redirect users to phishing sites designed to harvest credentials, or initiate requests that trigger unintended administrative actions within the backup environment.
The impact extends beyond simple data theft due to the critical nature of Veeam Backup Enterprise Manager in enterprise environments. Compromise of this interface could allow an adversary to alter backup configurations, delete recovery points, or exfiltrate sensitive metadata about protected systems. This undermines the integrity and availability guarantees provided by the backup infrastructure. In terms of threat modeling, this attack vector aligns with ATT&CK technique T1059: Command and Scripting Interpreter, specifically through browser-based execution, and is often associated with initial access vectors like Spearphishing Link (T1566.002). The ability to execute scripts in the context of a trusted application makes this particularly dangerous as it bypasses many traditional network-level security controls that do not inspect encrypted web traffic or validate client-side behavior.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary defense is for administrators to apply the latest vendor-provided patches and updates, which typically include fixes for input validation logic in the affected components. In environments where patching cannot be immediately implemented, network-level controls such as Web Application Firewalls (WAF) can be configured with rulesets designed to detect and block common XSS payloads based on signature patterns or behavioral anomalies. Additionally, implementing strict Content Security Policy headers can restrict the sources from which scripts are allowed to execute, thereby neutralizing many injected script attacks even if they bypass input validation. Regular security awareness training for users is also essential to reduce the likelihood of successful social engineering campaigns that rely on clicking malicious links.