Critical CVE-2026-60198 WebLogic Server Remote Code Execution Triage

1. Overview & Executive Summary

Oracle WebLogic Server serves as the application server foundation for major enterprise ERP platforms, including PeopleSoft Internet Architecture (PIA), Ellucian Banner Admin/SSB, and Oracle REST Data Services (ORDS). Critical vulnerability CVE-2026-60198 represents an unauthenticated Remote Code Execution (RCE) flaw in the WebLogic T3 and IIOP protocol deserialization engine.

Unauthenticated attackers sending crafted T3 or IIOP payloads to exposed WebLogic administration ports (default 7001/7002) can execute arbitrary operating system commands with the privileges of the oracle service account.

This triage guide delivers an immediate response runbook: network exposure scanning, connection filter mitigation via WLST, emergency OPatch application, and post-remediation security validation.

Process Flow

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2. Diagnostic Checklist

Run these diagnostic checks to evaluate whether your WebLogic domain is exposed to CVE-2026-60198.

2.1 WebLogic Version & Patch Level

# Set WebLogic domain environment
source /u01/app/oracle/middleware/user_projects/domains/peoplesoft/bin/setDomainEnv.sh

# Check installed WebLogic OPatch patches
$ORACLE_HOME/OPatch/opatch lsinventory | grep -E "Patch|WebLogic"

Expected output: Verify whether the latest Critical Patch Update (CPU) containing CVE-2026-60198 fix is listed in opatch lsinventory.

2.2 T3 & IIOP Protocol Port Exposure Scan

# Scan listening ports for T3 protocol handshake using Nmap
nmap -p 7001,7002,7003 --script weblogic-t3-info <weblogic_host>

# Check listening ports on the local server
netstat -tulnp | grep -E "7001|7002|7003"

Expected output: If T3 protocol handshake returns T3 12.2.1.4.0 from external/untrusted subnets, your domain is exposed.

2.3 WebLogic Access Log Scan for Exploitation Attempts

# Scan WebLogic access logs for anomalous T3/IIOP payloads
grep -E "t3|iiop|deserialization" $DOMAIN_HOME/servers/*/logs/access.log* | tail -50

# Inspect server diagnostic logs for Java deserialization errors
grep -i "java.lang.ClassNotFoundException" $DOMAIN_HOME/servers/*/logs/*.log | tail -20

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3. Step-by-Step Resolution Runbook

Step 0: Safety Checks

⚠️ EMERGENCY ACTION: Before executing patching or protocol changes:

1. Take a full VM snapshot or LVM storage backup of the WebLogic Middleware home ($MW_HOME).
2. Coordinate a brief application server restart window with system administrators.

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Step 1: Immediate Network & Connection Filter Mitigation via WLST

If immediate patching cannot be completed, block external T3 and IIOP access using WebLogic Connection Filters configured via WLST.

# Connect to WLST (WebLogic Scripting Tool) in online mode
$MW_HOME/oracle_common/common/bin/wlst.sh

Execute WLST commands using proper MBean object invocations:

# WLST Online Script
connect('weblogic', 'AdminPassword123', 't3://localhost:7001')
edit()
startEdit()

# Access SecurityConfiguration MBean for current domain
cd('/SecurityConfiguration/' + cmo.getName())

# Set Connection Filter Implementation on SecurityConfiguration MBean
cmo.setConnectionFilter('weblogic.security.net.ConnectionFilterImpl')

# Define Connection Filter Rules (Allow local T3, block external T3/IIOP)
set('ConnectionFilterRules', jarray.array([
    String('127.0.0.1 * * allow t3 t3s'),
    String('10.0.0.0/8 * * allow t3 t3s'),
    String('0.0.0.0/0 * * deny t3 t3s iiop iiops')
], String))

save()
activate()
disconnect()
exit()

Restart WebLogic AdminServer and Managed Servers to apply rules:

$DOMAIN_HOME/bin/stopWebLogic.sh
$DOMAIN_HOME/bin/startWebLogic.sh

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Step 2: Emergency Patch Application via OPatch

Apply the emergency WebLogic CPU patch bundle.

# 1. Stop all WebLogic Admin and Managed Servers
$DOMAIN_HOME/bin/stopNodeManager.sh
$DOMAIN_HOME/bin/stopWebLogic.sh

# 2. Verify no java or WebLogic processes remain active
ps -ef | grep java

# 3. Apply the patch bundle using OPatch
cd /u01/app/oracle/patches/<PATCH_NUMBER>
$ORACLE_HOME/OPatch/opatch apply -oh $MW_HOME

# 4. Restart Node Manager and Servers
$DOMAIN_HOME/bin/startNodeManager.sh
$DOMAIN_HOME/bin/startWebLogic.sh

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Step 3: Disable IIOP Protocol Channel via WLST (If Unused)

If your enterprise architecture does not use IIOP:

# WLST Online Script to Disable IIOP
connect('weblogic', 'AdminPassword123', 't3://localhost:7001')
edit()
startEdit()

# Navigate to Managed Server MBean and disable IIOP
cd('/Servers/AdminServer')
cmo.setIIOPEnabled(false)

cd('/Servers/PIA_SERVER1')
cmo.setIIOPEnabled(false)

save()
activate()
disconnect()
exit()

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Step 4: Verification & Security Validation

Verify that WebLogic is protected against CVE-2026-60198:

# 1. Confirm OPatch inventory lists the patch
$ORACLE_HOME/OPatch/opatch lsinventory | grep "<PATCH_NUMBER>"

# 2. Verify T3 protocol exposure is blocked from untrusted clients
nmap -p 7001,7002,7003 --script weblogic-t3-info <weblogic_host>

Expected output: Nmap reports T3 probe connection refused or filtered by connection rules.

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📚 Official Documentation & Technical References

Oracle Documentation

• Oracle WebLogic Server Security Guide, 12c (12.2.1.4)
• Oracle WebLogic Server WLST Command Reference, 12c (12.2.1.4)

My Oracle Support

For official My Oracle Support security alerts and patch availability documents for WebLogic:

• Doc ID 2806740.1: Critical Patch Update (CPU) Patch Availability Document for Oracle WebLogic / PeopleSoft

Related Resources

• Oracle Critical Patch Update Security Alerts Main Page

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Need Emergency Security Assistance?

Vulnerability triage and emergency patching across enterprise WebLogic and ERP application server clusters require rapid execution and zero-downtime precision. DBPros.Net’s certified security and middleware engineers can help you:

• Audit & Triage WebLogic T3/IIOP exposure across PeopleSoft, Banner, and ORDS domains
• Configure & Deploy robust Connection Filters and WAF rules
• Apply & Verify emergency CPU security patches without operational disruption
• Harden WebLogic Node Manager, SSL/TLS, and domain security configurations 24/7/365

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