CVE-2021-20556: IBM Cognos Controller

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames. IBM X-Force ID: 199181.

Affected products

• IBM Cognos Controller: version 10.4.1 only; version 10.4.2 only; version 11.0.0 only

Published 2024-05-03. Last modified 2026-06-17.