CVE-2026-18221
High
Description
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
I
PublishedSep 4, 2026
First seenSep 4, 2026
Weakness typeCWE-287Improper authentication
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ibm i | 7.3, 7.4, 7.5, 7.6 | — |
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