Oracle: Critical Oracle WebLogic Server Proxy Vulnerability Lets Attackers Compromise the Server

Oracle Discloses Critical Proxy Vulnerability in Fusion Middleware (CVE-2026-21962)

Oracle has revealed a severe security flaw (CVE-2026-21962) in its Fusion Middleware suite, specifically affecting the Oracle HTTP Server and WebLogic Server Proxy Plug-in. The vulnerability, rated CVSS 10.0, enables unauthenticated remote attackers to exploit systems without user interaction, posing a major risk to enterprise environments.

The flaw lies in how the WebLogic Server Proxy Plug-ins for Apache HTTP Server and Microsoft IIS process incoming requests. Due to its location in the proxy layer, attackers can bypass security controls entirely, gaining unauthorized access to sensitive data and the ability to create, delete, or modify system data. The vulnerability’s "Scope Change" (S:C) metric indicates that successful exploitation could extend beyond the plug-in, potentially compromising backend WebLogic Server environments.

Affected Versions:

• Oracle HTTP Server / Proxy Plug-in: 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0
• WebLogic Server Proxy Plug-in for IIS: 12.2.1.4.0

Oracle has released patches in its Critical Patch Update (CPU), with temporary mitigation recommending restricted network access to affected HTTP ports if immediate patching is not possible. The flaw’s low attack complexity and high impact make it a priority for organizations using these components.

Source: https://cybersecuritynews.com/oracle-weblogic-server-proxy-vulnerability/

Oracle cybersecurity rating report: https://www.rankiteo.com/company/oracle

"id": "ORA1768994894",
"linkid": "oracle",
"type": "Vulnerability",
"date": "1/2026",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"

{'affected_entities': [{'industry': 'Technology/Software',
                        'name': 'Oracle',
                        'type': 'Corporation'}],
 'attack_vector': 'Remote',
 'data_breach': {'type_of_data_compromised': 'Sensitive data'},
 'description': 'Oracle has revealed a severe security flaw (CVE-2026-21962) '
                'in its Fusion Middleware suite, specifically affecting the '
                'Oracle HTTP Server and WebLogic Server Proxy Plug-in. The '
                'vulnerability, rated CVSS 10.0, enables unauthenticated '
                'remote attackers to exploit systems without user interaction, '
                'posing a major risk to enterprise environments. The flaw lies '
                'in how the WebLogic Server Proxy Plug-ins for Apache HTTP '
                'Server and Microsoft IIS process incoming requests. Due to '
                'its location in the proxy layer, attackers can bypass '
                'security controls entirely, gaining unauthorized access to '
                'sensitive data and the ability to create, delete, or modify '
                "system data. The vulnerability’s 'Scope Change' (S:C) metric "
                'indicates that successful exploitation could extend beyond '
                'the plug-in, potentially compromising backend WebLogic Server '
                'environments.',
 'impact': {'data_compromised': 'Sensitive data',
            'operational_impact': 'Unauthorized creation, deletion, or '
                                  'modification of system data',
            'systems_affected': 'Oracle HTTP Server, WebLogic Server Proxy '
                                'Plug-in'},
 'post_incident_analysis': {'corrective_actions': 'Patches released, network '
                                                  'access restrictions '
                                                  'recommended',
                            'root_causes': 'Flaw in how WebLogic Server Proxy '
                                           'Plug-ins process incoming '
                                           'requests'},
 'recommendations': "Apply patches from Oracle's Critical Patch Update (CPU) "
                    'and restrict network access to affected HTTP ports if '
                    'immediate patching is not possible.',
 'references': [{'source': 'Oracle Critical Patch Update (CPU)'}],
 'response': {'containment_measures': 'Restricted network access to affected '
                                      'HTTP ports',
              'remediation_measures': 'Patches released in Critical Patch '
                                      'Update (CPU)'},
 'title': 'Oracle Discloses Critical Proxy Vulnerability in Fusion Middleware '
          '(CVE-2026-21962)',
 'type': 'Vulnerability Exploitation',
 'vulnerability_exploited': 'CVE-2026-21962'}