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CVE-2026-70748 – Unauthenticated RCE (Server Takeover) – Oracle WebLogic Server 12.2.1.4.0–15.1.1.0.

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Summary

CVE-2026-70748 is a critical, unauthenticated remote code execution vulnerability in the Core component of Oracle WebLogic Server, part of Oracle Fusion Middleware. An attacker with only network access to the T3 or IIOP listener can fully compromise the server without any credentials or user interaction. Oracle rates the flaw 9.8 (Critical) on the CVSS v3.1 scale.

Technical details

  • Root cause: a flaw in the Oracle WebLogic Server Core component that can be reached and abused via the T3 and IIOP protocols.
  • Trigger conditions: the attacker needs only network reachability to a WebLogic listener exposing T3 or IIOP; no authentication or prior access is required, and the attack is described by Oracle as "easily exploitable."
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: successful exploitation results in complete takeover of the Oracle 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
  • Oracle WebLogic Server 15.1.1.0.0

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: apply the fix provided in Oracle’s September 2026 Critical Security Patch Update for the affected WebLogic Server versions (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0).
  • If patching cannot be performed immediately: restrict network access to the T3 and IIOP protocols/ports from untrusted networks (e.g., block or firewall T3/T3S and IIOP at the network perimeter), and limit WebLogic Server exposure to trusted internal networks only, as Oracle has not published an alternative workaround.

References

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