CVE-2026-16867
NTLM auth flaw on IBM i allows authenticated remote privilege escalation
Is CVE-2026-16867 being exploited?
Not confirmed. CVE-2026-16867 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-16867?
CVE-2026-16867 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-16867?
Yes. A fix has been recorded for CVE-2026-16867. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16867 affect?
CVE-2026-16867 affects IBM i 7.6, IBM i 7.5, IBM i 7.4, IBM i 7.3. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16867?
Apply vendor patch when available; restrict NTLM, harden auth, and monitor logs
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can obtain the privileges of an authenticated user via improper NTLM negotiation, enabling privilege escalation and unauthorized access to server resources.
Patch when possible
- affected7.6
- affected7.5
- affected7.4
- affected7.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.