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9.8

IBM i: Unauthorized Access via NTLM Session Negotiation

CVE-2026-16867 · published 21 days ago
Summary

IBM i systems with affected versions are vulnerable to unauthorized access. An attacker can exploit this vulnerability if they can trick a legitimate user into authenticating with the system. Users should update their systems to the latest version of IBM i to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm i 7.6
7.3
7.4
7.5
Original advisory text
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to access server resources with the privileges of an authenticated user due to improper authentication during NTLM session negotiation.
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to access server resources with the privileges of an authenticated user due to improper authentication during NTLM session negotiation.
References
Severity
9.8 Critical
CVSS 3.1: 8.1 (MITRE)
Exploitation
EPSS <1%
Type
CWE-287Improper Authentication
Timeline
Published13 Aug 2026
Updated3 Sep 2026
First seen13 Aug 2026
Sources
CVE-2026-16867 · NVD
CVE-2026-16867 · MITRE
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