---
id: CVE-2026-18221
title: >-
  IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain
  unauthorized access due to improper validation of client-supplied
  authentication parameters.
summary: >-
  IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain
  unauthorized access due to improper validation of client-supplied
  authentication parameters.
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
vendor: ibm
product: i
affected:
  - i = 7.3
  - i = 7.4
  - i = 7.5
  - i = 7.6
published: '2026-09-04'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:40:12.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18221'
references:
  - url: 'https://www.ibm.com/support/pages/node/7286186'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T17:21:54.094713Z'
epss: 0.00339
epssPercentile: 0.2454
ingestedAt: '2026-09-08T15:33:26.963Z'
---

## Overview

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain unauthorized access due to improper validation of client-supplied authentication parameters.

## Affected

- `i = 7.3`
- `i = 7.4`
- `i = 7.5`
- `i = 7.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.