Ibm Websphere Extreme Scale — CVE-2026-13772 (Critical)

Summary

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName() and invokes their constructors with no allow-list at three distinct sinks (SELECT NEW, enum literals, and reflection-based comparators); an authenticated remote attacker who can influence an application-built OQL query string can execute arbitrary constructors on the WAS JVM, and a SELECT DISTINCT variant using planted grid values fires the same gadget post-readObject in a manner that survives JEP-290 serialization filters across grid node boundaries

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 7.5) in Ibm Websphere Extreme Scale. Patch or mitigate promptly. EPSS percentile: 18%.

Operator check

Review CVE-2026-13772 in your asset inventory. Apply patches per vendor guidance and verify Websphere Extreme Scale is not exposed. CVSS score: 7.5. EPSS probability: 0.3%; percentile: 18%.

Sources