CVE-2026-2311: IBM I

Critical severity, CVSS 9.8. EPSS: 0.2% chance of exploitation in the next 30 days.

IBM i 7.6, 7.5, 7.4, 7.3, and 7.2 s vulnerable to privilege escalation caused by an invalid IBM i Web Administration GUI authorization check.  A malicious actor could cause user-controlled code to run with administrator privilege.

Affected products

• IBM I: version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only

Published 2026-04-30. Last modified 2026-06-17.