Cyber Posture

CVE-2026-8620

High
Microsoft: not affectedMSmacOS: not affectedMacLinux: not affectedLnxMobile: not affectedMobNetwork: not affectedNetApplication: not affectedAppOther: affectedOth

Published: 26 May 2026

Published
26 May 2026
Modified
26 May 2026
KEV Added
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Patch
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CVSS Score 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
EPSS Score 0.0005 15.3th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-8620 is a high-severity HTTP Request/Response Smuggling (CWE-444) vulnerability in Ibm (inferred from references). Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 15.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190).
Threat & Defense Details

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 vulnerability in public-facing WebSphere web server plug-in directly enables exploitation of the application via crafted requests (CWE-444).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM WebSphere Application Server and WebSphere Application Server Liberty are vulnerable to HTTP request smuggling in the Web Server Plug-ins through a specially crafted request.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-444
OWASP Top 10 Web 2025
A06:2025

Affected Products

Ibm
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inferred from references and description; NVD did not file a CPE for this CVE

EU & UK References

References