CVE-2026-18847 in IBM
Summary
by MITRE • 08/12/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote unauthenticated attacker to harvest credentials due to spoofing of Navigator for i.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability affects IBM i operating systems version 7.6, 7.5, 7.4, and 7.3, presenting a significant security risk through credential harvesting via navigator spoofing techniques. The flaw resides in the Navigator for i component which provides web-based management interfaces for IBM i systems, creating an attack vector that allows remote unauthenticated adversaries to exploit trust relationships within the system architecture.
The technical implementation of this vulnerability stems from insufficient authentication verification mechanisms within the Navigator for i service. Attackers can manipulate web requests and session handling to deceive the system into believing they are legitimate users, thereby gaining access to credential storage areas or user session information. This type of spoofing attack exploits weaknesses in how the navigator component validates client identity and maintains secure communication channels.
The operational impact of this vulnerability extends beyond simple credential theft, potentially enabling attackers to escalate privileges and gain deeper system access. Once credentials are harvested, malicious actors can leverage them for persistent access, data exfiltration, or further exploitation within the enterprise network. The remote nature of the attack means that threat actors do not require physical access or prior authentication to exploit this weakness, significantly expanding the potential attack surface.
Organizations running affected IBM i versions should immediately implement patch management procedures to address this vulnerability through official IBM security updates. Network segmentation and monitoring solutions should be deployed to detect anomalous navigation patterns and session behaviors that may indicate exploitation attempts. Additionally, implementing stronger authentication mechanisms such as multi-factor authentication for Navigator for i access can provide defense-in-depth measures against credential harvesting attacks.
This vulnerability aligns with CWE-305 authentication weakness categories and maps to ATT&CK techniques including credential harvesting through web application exploitation and session manipulation. The attack vector specifically relates to credential access tactics where adversaries seek to obtain valid credentials from compromised systems, potentially leading to lateral movement and persistent access within enterprise environments. Organizations should also consider implementing web application firewalls and monitoring for suspicious navigation patterns that could indicate spoofing attempts targeting the Navigator for i component.