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IBM WebSphere Application Server CVE-2026-8400

| EUVDEUVD-2026-53438 CRITICAL
Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') (CWE-470)
2026-08-05 ibm GHSA-m4rx-9mrh-59g9
IBM Java Information Disclosure Websphere Application Server Websphere Application Server Liberty Red Hat Suse
9.8
CVSS 3.1 · NVD
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Severity by source

Vendor (ibm) PRIMARY
HIGH
qualitative
NVD
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

Network-facing ORB with no auth (AV:N/PR:N), but attacker must control/impersonate the IIOP server the victim connects to, raising complexity to AC:H; class instantiation yields full C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat
8.1 HIGH
qualitative

Primary rating from Vendor (ibm).

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Analysis Updated
Aug 10, 2026 - 16:13 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 10, 2026 - 16:07 vuln.today
cvss_changed
Severity Changed
Aug 10, 2026 - 16:07 NVD
HIGH CRITICAL
CVSS changed
Aug 10, 2026 - 16:07 NVD
8.1 (HIGH) 9.8 (CRITICAL)
Analysis Generated
Aug 05, 2026 - 16:36 vuln.today
CVE Published
Aug 05, 2026 - 15:58 nvd
HIGH 8.1

DescriptionNVD

IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.

AnalysisAI

Unsafe class loading in the ORB (Object Request Broker) component of IBM WebSphere Application Server 8.5, 9.0, and Liberty Continuous Delivery allows a malicious or attacker-controlled IIOP server to force a WebSphere client/server to load and instantiate arbitrary Java classes over the network. Exploitation requires no authentication or user interaction (CVSS 9.8), and successful abuse can lead to loss of confidentiality, integrity, and availability, potentially culminating in remote code execution via dangerous class instantiation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Position rogue/impersonated IIOP server
Delivery
WebSphere ORB connects over IIOP
Exploit
Malicious server supplies attacker-chosen class type
Execution
ORB loads and instantiates arbitrary class
Impact
Achieve code execution / total compromise
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Vulnerability AssessmentAI

Exploitation Exploitation requires the WebSphere ORB to establish an IIOP/CORBA connection to an attacker-controlled or attacker-impersonated IIOP server, at which point the malicious server induces loading and instantiation of arbitrary classes via the vulnerable ORB in the IBM SDK, Java Technology Edition. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The raw CVSS 3.1 score of 9.8 (AV:N/AC:L/PR:N/UI:N, total C/I/A impact) marks this as critical, and CISA's SSVC framework rates Technical Impact as 'total,' consistent with arbitrary class loading leading to full compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker stands up or hijacks an IIOP/CORBA server (or man-in-the-middles an existing ORB connection) that a WebSphere endpoint is configured or lured into contacting; when the WebSphere ORB processes the malicious server's responses, it is coerced into loading and instantiating an attacker-chosen class. With AV:N/AC:L/PR:N, no credentials or user interaction are needed, and instantiating a suitably dangerous class can yield code execution or full compromise. …
Remediation Apply the IBM-provided fix per the vendor advisory at https://www.ibm.com/support/pages/node/7282446 (Patch available per vendor advisory); the exact fixed fix pack/interim fix version is not stated in the provided data, so consult that IBM support note for the precise APAR/fix pack level for your 8.5, 9.0, or Liberty CD stream and the corresponding IBM SDK Java update. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and catalog all IBM WebSphere Application Server instances (versions 8.5, 9.0, and Liberty Continuous Delivery) in your environment, particularly those with IIOP (Internet Inter-ORB Protocol) exposure. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise Module for Legacy 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Affected

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CVE-2026-8400 vulnerability details – vuln.today
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