Ibm Websphere Application Server — CVE-2026-8646 (Critical)

Date Jun 22, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Ibm · Websphere Application Server

CVE CVE-2026-8646

Critical vendor advisory CVE-2026-8646

Summary

IBM WebSphere Application Server 9.0 and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 7.4) in Ibm Websphere Application Server. Patch or mitigate promptly. EPSS percentile: 27%.

Operator check

Review CVE-2026-8646 in your asset inventory. Apply patches per vendor guidance and verify Websphere Application Server is not exposed. CVSS score: 7.4. EPSS probability: 0.4%; percentile: 27%.

Sources

NVD — CVE-2026-8646 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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