IBM i 7.6/7.5/7.4/7.3 auth param validation flaw
CVE-2026-18221 Published on September 4, 2026

IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DRDA [, ]
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-18221 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is an authentification Vulnerability?

When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.

CVE-2026-18221 has been classified to as an authentification vulnerability or weakness.


Products Associated with CVE-2026-18221

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IBM I
 

Affected Versions

IBM i: