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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
Java Information Disclosure IBM Red Hat Websphere Application Server Suse Websphere Application Server Liberty
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

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. There is no public exploit identified at time of analysis, and EPSS estimates only a 0.44% probability of exploitation in the next 30 days.

Technical ContextAI

The vulnerability resides in the CORBA/IIOP Object Request Broker (ORB) shipped with the IBM SDK, Java Technology Edition, which underpins WebSphere's distributed object communication. IIOP (Internet Inter-ORB Protocol) allows Java objects to be marshalled and exchanged between ORBs; when a WebSphere endpoint connects to a remote IIOP server, that server can influence which classes the client resolves and instantiates during deserialization/stub resolution. CWE-470 (Use of Externally-Controlled Input to Select Classes or Code, i.e. 'unsafe reflection') is the root cause: the ORB uses attacker-influenced type information to drive Class.forName/newInstance-style loading without adequately constraining the permitted class set, so a hostile IIOP peer can steer instantiation toward gadget or side-effecting classes. Affected CPEs are cpe:2.3:a:ibm:websphere_application_server and cpe:2.3:a:ibm:websphere_application_server_-_liberty.

RemediationAI

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. As a compensating control until patched, restrict WebSphere to communicate only with trusted IIOP/ORB endpoints - use network segmentation and firewall rules to block outbound IIOP (typically the ORB bootstrap/listener ports such as 2809 and the ORB's dynamically negotiated ports) to untrusted hosts, and avoid configuring WebSphere clients to connect to ORB servers you do not control, accepting that this may break legitimate cross-cell CORBA/IIOP integrations. Where supported, enforce ORB/serialization allow-lists so only expected classes can be resolved, noting that overly strict lists can break RMI-IIOP interoperability; verify the specific fixed version from IBM before closing remediation.

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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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