CVE-2026-8620

IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: Low
Availability: None

Exploit likelihood

0.28%Up 0.2 points since May 27, 2026

What each source reports

CVE List Score used 7.5

IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins

Record: CVE-2026-8620
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Weakness: CWE-444
Updated: 2026-11-02

EUVDEUVD-2026-31921 7.5

Record: EUVD-2026-31921
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qwgm-xj6f-w5v6 7.5

IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM...

Record: GHSA-qwgm-xj6f-w5v6
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Weakness: CWE-444
Updated: 2026-11-02

NVD 7.5

Record: CVE-2026-8620
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Weakness: CWE-444
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-8620 is a high vulnerability (CVSS 7.5) in Ibm Web Server Plug-ins For Websphere Application Server And Websphere Liberty, published May 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. No source names a fixed version.