CVE-2026-11538: IBM WebSphere Application Server

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 9.0 and 8.5 is affected by a log injection vulnerability through crafted LTPA token cookies.

Affected products

• IBM WebSphere Application Server: from 8.5, before 8.5.5.31 (fixed in 8.5.5.31); from 9.0, before 9.0.5.29 (fixed in 9.0.5.29)

Published 2026-09-18. Last modified 2026-09-24.