Improper Authentication in IBM i Server
CVE-2026-18221

8.1HIGH

Key Information:

Vendor

IBM
Status
I
Vendor
CVE Published:
4 September 2026

What is CVE-2026-18221?

IBM i versions 7.6, 7.5, 7.4, and 7.3 are susceptible to a security issue that could enable remote attackers to exploit improper validation of authentication parameters supplied by clients. This vulnerability raises significant concerns regarding unauthorized access, granting attackers potential permissions to sensitive resources. It is crucial for users and administrators to review the advisory from IBM and implement the necessary updates to safeguard their systems.

Affected Version(s)

i 7.6

i 7.5

i 7.4

References

https://www.ibm.com/support/pages/node/7286186
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.