CVE-2026-18098 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 obtain sensitive information and compromise system integrity due to an XML injection flaw.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical security weakness in IBM i operating systems versions 7.6, 7.5, 7.4, and 7.3 that stems from an XML injection flaw within the system's processing mechanisms. The vulnerability allows remote authenticated attackers to exploit weaknesses in how the system handles XML data input, potentially leading to unauthorized access to sensitive information and compromise of system integrity. Such flaws typically occur when applications fail to properly validate or sanitize XML input before processing, creating opportunities for malicious actors to manipulate system behavior through crafted XML payloads.
The technical implementation of this vulnerability involves the improper handling of XML data structures within IBM i's core processing components, particularly affecting systems that utilize XML-based communication protocols or data exchange mechanisms. Attackers can leverage this weakness by submitting specially crafted XML content that bypasses normal input validation controls, potentially allowing them to extract system information, access restricted resources, or manipulate system operations. This type of vulnerability aligns with CWE-91 and CWE-92 categories related to XML injection and processing flaws, where insufficient input sanitization creates pathways for attackers to influence program execution flow.
The operational impact of this vulnerability extends beyond simple data exposure, as successful exploitation can result in complete compromise of system integrity and potential lateral movement within network environments. Remote authenticated access means that attackers need only valid credentials to potentially escalate privileges or extract confidential information from the system. This represents a significant risk for enterprise environments where IBM i systems often serve critical business functions and store sensitive operational data. The vulnerability's presence across multiple versions indicates a systemic flaw in the XML processing libraries or frameworks used throughout these operating system releases.
Organizations utilizing affected IBM i versions should implement immediate mitigations including input validation enhancements, XML schema enforcement, and comprehensive monitoring of XML processing activities. System administrators should review and strengthen authentication controls while implementing network segmentation to limit potential attack vectors. Regular security updates from IBM addressing the specific XML injection flaws should be prioritized, along with comprehensive vulnerability assessments to identify systems that may be vulnerable to similar weaknesses. This vulnerability demonstrates the importance of proper input validation practices and aligns with ATT&CK techniques related to privilege escalation and information gathering through exploitation of application-level vulnerabilities.