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CVE-2026-83021 – Unauthenticated RCE / Full Takeover – Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0

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Summary

CVE-2026-83021 is a critical, unauthenticated remote code execution vulnerability in the Web Container component of Oracle WebLogic Server, part of Oracle Fusion Middleware. The flaw is remotely exploitable over HTTP without any authentication or user interaction, and a successful attack results in complete takeover of the WebLogic Server. It carries the maximum CVSS v3.1 base score of 10.0.

Technical details

  • Root cause: The vulnerability resides in the Web Container component of Oracle WebLogic Server.
  • Trigger conditions: Oracle describes the flaw as "easily exploitable" by an attacker with network access via HTTP, requiring no authentication and no user interaction.
  • Attack vector: Network (HTTP), with low attack complexity.
  • Scope: The CVSS vector reflects a scope change (S:C) — Oracle notes that while the vulnerability resides in WebLogic Server, successful attacks may significantly impact additional products beyond WebLogic itself.
  • Impact: Full compromise (takeover) of the WebLogic Server, with high impact to confidentiality, integrity, and availability.

Affected software

  • Oracle WebLogic Server 12.2.1.4.0
  • Oracle WebLogic Server 14.1.1.0.0
  • Oracle WebLogic Server 14.1.2.0.0

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the Oracle Critical Patch Update that addresses CVE-2026-83021 for the affected WebLogic Server release (12.2.1.4.0, 14.1.1.0.0, or 14.1.2.0.0) as detailed in Oracle’s September 2026 Critical Patch Update advisory.
  • If patching cannot be applied immediately: Restrict network access to WebLogic Server management and application listen ports from untrusted networks, place WebLogic instances behind a properly configured firewall/WAF, and monitor for anomalous HTTP requests to WebLogic endpoints until the patch can be deployed. Oracle strongly recommends applying the official fix as soon as possible given the unauthenticated, network-exploitable nature of this flaw.

References

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