CVE-2026-8633 | 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 remote code execution in the Web Server Plug-ins, through a specially crafted request.

Published: 2026-05-26 Last update: 2026-05-27 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-8633 is rated Moderate Risk (56.6/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.26%). Review affected assets and schedule remediation.

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-2026-8633

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 0.20% 0.26% +0.06%
2 2026-05-27 — 0.20% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-8633

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-8633

GitHub Security Advisory for CVE-2026-8633

GHSA-536c-j2qm-3hw6 · Severity: critical — IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM...

Affected software / configurations for CVE-2026-8633

Vendor Product Version Raw CPE
ibm websphere_application_server >= 8.5.0.0, <= 8.5.5.29 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:-:*:*:*
ibm websphere_application_server >= 8.5.0.0, <= 8.5.5.29 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*
ibm websphere_application_server >= 9.0.0.0, <= 9.0.5.27 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:-:*:*:*
ibm websphere_application_server >= 9.0.0.0, <= 9.0.5.27 cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*

References for CVE-2026-8633

cvelogic Threat Intelligence