CVE-2026-44753 in HANA Database
Summary
by MITRE • 07/14/2026
SAP HANA Database (user self service tools) allows an unauthenticated user to send specially crafted requests that produce distinguishable responses, enabling enumeration of valid user accounts and email addresses. Successful exploitation could allow the attacker to enumerate valid user accounts, resulting in low impact on confidentiality, with no impact on integrity and availability of the application.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability exists within SAP HANA Database user self service tools where improper input validation allows unauthenticated attackers to perform account enumeration attacks through crafted requests that generate distinguishable responses. The flaw stems from insufficient response differentiation mechanisms that reveal whether a requested user account or email address exists within the system, creating a predictable pattern of responses that can be analyzed by attackers. This vulnerability falls under CWE-200 - Information Exposure and aligns with ATT&CK technique T1087.001 - Account Discovery: Local Accounts, as it enables unauthorized enumeration of valid credentials without requiring authentication. The technical implementation appears to lack proper error handling or response uniformity when processing user lookup requests, allowing attackers to distinguish between valid and invalid account attempts based on response characteristics such as timing differences, error messages, or HTTP status codes.
The operational impact of this vulnerability remains relatively low in terms of confidentiality breach, as it only provides information about the existence of accounts rather than actual credentials or sensitive data. However, the enumeration capability creates a significant reconnaissance opportunity for attackers who can then use this information for targeted attacks such as credential stuffing, brute force attempts, or social engineering campaigns. The vulnerability affects the application's authentication security posture by reducing the attack surface complexity for malicious actors seeking to compromise user accounts. Attackers can systematically test various username and email combinations to build comprehensive lists of valid accounts within the SAP HANA environment, which serves as a foundational step for more advanced exploitation techniques.
The primary mitigation strategies involve implementing uniform response handling for all user lookup requests regardless of account validity, ensuring that successful and failed authentication attempts generate identical response patterns to prevent information leakage. Organizations should configure SAP HANA systems to enforce consistent error messaging and implement rate limiting or request throttling mechanisms to prevent automated enumeration attacks. Network-level controls including firewall rules and intrusion detection systems can monitor for suspicious patterns of repeated user enumeration requests. Additionally, implementing proper input validation and sanitization processes within the self-service tools will help prevent malformed requests from being processed in ways that reveal account information. Regular security assessments and penetration testing should verify that response uniformity has been properly implemented across all authentication and account management functions to maintain the integrity of the security controls.