Cyber Resilience

CVE-2026-8646

High

Published: 22 June 2026

Published
22 June 2026
Modified
24 June 2026
KEV Added
—
Patch
—
CVSS Score v3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0034 25.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-8646 is a high-severity HTTP Request/Response Smuggling (CWE-444) vulnerability in Ibm Websphere Application Server. Its CVSS base score is 7.4 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A06:2025 Insecure Design

EU & UK References

Vulnerability details

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…

more

to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.

CWE(s)
CWE-444

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

HTTP request smuggling in a public-facing application server directly enables remote exploitation via T1190, leading to bypasses and unauthorized access.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

ibm
websphere application server
8.5.0.0 — 8.5.5.30 · 9.0.0.0 — 9.0.5.29 · 17.0.0.3 — 26.0.0.7

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References