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CVE-2026-70756 – Unauthenticated RCE via T3/IIOP – Oracle WebLogic Server 12.2.1.4.0–15.1.1.0.0

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Summary

CVE-2026-70756 is a critical, easily exploitable vulnerability in Oracle WebLogic Server that allows an unauthenticated attacker with network access via the T3 or IIOP protocols to compromise the server. Successful exploitation can result in complete takeover of Oracle WebLogic Server, with high impact to confidentiality, integrity, and availability. The flaw is rated CVSS 9.8 (Critical) and was disclosed by Oracle in its September 2026 Critical Security Patch Update.

Technical details

  • Root cause: a flaw in the WebLogic Server core component reachable through its native remote object protocols.
  • Trigger conditions: the attacker requires network access to a WebLogic listener exposing the T3 and/or IIOP protocol; no authentication or user interaction is needed.
  • Attack vector: network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: complete compromise of Oracle WebLogic Server, with high loss of confidentiality, integrity, and availability (scope unchanged).

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 listed above.
  • If patching cannot be applied immediately: restrict or block network access to the T3 and IIOP protocols at the firewall for any WebLogic listeners exposed to untrusted networks, since Oracle has historically recommended disabling or restricting these protocols when they are not required for inter-server communication.
  • Continue to monitor Oracle’s security alert channel for any updates or additional guidance related to this advisory.

References

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