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CVE-2026-16867 is an improper authentication vulnerability affecting IBM i versions 7.3, 7.4, 7.5, and 7.6. The flaw occurs during NTLM session negotiation and can allow a remote attacker to access server resources with the privileges of an authenticated user. The issue is classified as CWE-287 and affects the authentication logic rather than requiring prior valid credentials. Available scoring indicates network-based exploitation with no user interaction and no privileges required, although attack complexity is rated high.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper authentication vulnerability in IBM i that could allow a remote attacker to access server resources with the privileges of an authenticated user during NTLM session negotiation.
An improper authentication vulnerability in IBM i NetServer during NTLM session negotiation that could allow a remote attacker to access server resources with the privileges of an authenticated user.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.