CVE-2026-17268 in IBM
Summary
by MITRE • 08/12/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to bypass security restrictions due to improper validation of a session token.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability exists within IBM i operating systems versions 7.6, 7.5, 7.4, and 7.3, where an authenticated attacker can exploit improper session token validation to bypass security restrictions. The flaw resides in the authentication mechanism's failure to properly validate session tokens, allowing malicious users to manipulate or reuse valid tokens to gain unauthorized access to restricted system resources. This represents a critical security weakness that directly impacts the integrity of the authentication framework.
The technical implementation of this vulnerability stems from inadequate input validation and token management within the IBM i security subsystem. When users authenticate to the system, session tokens are generated and validated to maintain secure access. However, the system fails to properly verify the authenticity and integrity of these tokens during subsequent requests, creating opportunities for privilege escalation attacks. This vulnerability aligns with CWE-287 which addresses improper authentication issues, specifically focusing on weak session management and token validation mechanisms.
From an operational perspective, this vulnerability enables attackers who have already established valid credentials to potentially escalate their privileges without additional authentication requirements. The impact extends beyond simple access bypass as it can lead to unauthorized data manipulation, system configuration changes, and potential lateral movement within the network infrastructure. Attackers could leverage this weakness to access sensitive system files, modify user permissions, or perform administrative functions that should be restricted to authorized personnel only.
The security implications of this vulnerability are particularly concerning given IBM i's role in enterprise environments where it often manages critical business applications and data repositories. Organizations using these older versions face significant risk as the vulnerability allows for persistent unauthorized access once exploited. The remote nature of the attack means that attackers do not require physical access to the system, making detection more challenging and increasing the potential impact across networked environments.
Organizations should immediately implement patches provided by IBM to address this session token validation weakness. Additionally, security teams should conduct comprehensive reviews of authentication logs to identify any suspicious activity patterns that might indicate exploitation attempts. Network segmentation and monitoring controls should be enhanced to detect anomalous token usage patterns. Implementing multi-factor authentication mechanisms and regular security assessments can help mitigate the risk associated with this vulnerability while maintaining operational continuity.
This vulnerability demonstrates the importance of proper session management in enterprise security architectures and aligns with ATT&CK technique T1548.002 which covers abuse of service accounts and privilege escalation through weak session handling. The attack surface is broad given that IBM i systems typically serve as central hubs for business-critical applications, making this vulnerability particularly attractive to adversaries seeking long-term access to enterprise environments.