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

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.

Published: 2026-05-26 Last update: 2026-06-02 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-8620 is rated Low Risk (37/100): CVSS High severity, with low exploitation likelihood (EPSS 0.06%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-8620

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-01 0.05% 0.06% +0.02%
2 2026-05-27 — 0.05% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-8620

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 4.7 [email protected]

Weakness enumeration for CVE-2026-8620

GitHub Security Advisory for CVE-2026-8620

GHSA-qwgm-xj6f-w5v6 · Severity: high — IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM...

Affected software / configurations for CVE-2026-8620

Vendor Product Version Raw CPE
ibm websphere_application_server >= 8.5.0.0, < 8.5.5.30 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:-:*:*:*
ibm websphere_application_server >= 8.5.0.0, < 8.5.5.30 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*
ibm websphere_application_server >= 9.0.0.0, < 9.0.5.28 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:-:*:*:*
ibm websphere_application_server >= 9.0.0.0, < 9.0.5.28 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*

References for CVE-2026-8620

URL Tags
https://www.ibm.com/support/pages/node/7274072 Vendor Advisory Patch
cvelogic Threat Intelligence