CVE-2026-17057 in IBM
Summary
by MITRE • 09/04/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service and affect data integrity due to missing authentication for critical functions.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in IBM i operating system versions 7.3 through 7.6 represents a critical security flaw rooted in the absence of mandatory access controls for specific administrative or internal functions. This deficiency allows an unauthenticated remote attacker to interact with sensitive subsystems that should be restricted to authorized personnel only. The core technical issue lies in the failure of the application logic to verify user credentials before executing privileged operations, effectively bypassing the authentication layer entirely. This type of flaw is commonly categorized under CWE-306, which describes a missing check for an incorrect or absent authentication credential during access control decisions. By exploiting this gap, an attacker can manipulate system states and data structures without needing valid login information, thereby undermining the fundamental security principle that only verified entities should perform critical actions.
The operational impact of this vulnerability is twofold, encompassing both availability assurance and data integrity protection. On one hand, a remote attacker can trigger conditions that lead to service degradation or complete unavailability, constituting a denial of service attack. This might involve exhausting system resources through malformed requests or forcing the operating system into an unrecoverable state by invoking unstable code paths within critical functions. On the other hand, and potentially more damagingly, the lack of authentication enables unauthorized modification of data integrity. An attacker can alter configuration files, database records, or system parameters that dictate how the IBM i environment operates. Such tampering can lead to persistent backdoors, corruption of business-critical information, or a complete compromise of the host's trustworthiness. This aligns with ATT&CK technique T1078, which involves valid accounts and credentials being used for unauthorized access, although in this specific case, no account is required at all due to the authentication bypass.
Mitigating this risk requires immediate attention from system administrators and security teams responsible for maintaining IBM i environments. The primary remediation step is to apply the latest available patches or service updates provided by IBM that address these missing authentication checks. Until patches are applied, organizations should implement network-level controls such as firewall rules to restrict access to the affected services exclusively to trusted IP addresses or management networks. Additionally, enabling comprehensive logging and monitoring for unauthorized access attempts can help in detecting exploitation activities early. It is also advisable to review and harden the configuration of any exposed interfaces that interact with these critical functions, ensuring that default configurations do not leave such vulnerabilities open by design. Regular security audits focusing on authentication mechanisms across all administrative tools are essential to prevent similar oversights in future updates or custom integrations.