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CVE-2026-83464 – Unauthenticated Remote Compromise – Oracle Mobile Application Server (MWA Terminal

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Summary

CVE-2026-83464 is a vulnerability in the MWA Terminal Server component of Oracle Mobile Application Server (part of Oracle E-Business Suite) that allows an unauthenticated attacker with network access via TCP to compromise the server. Although Oracle rates the flaw as "difficult to exploit," a successful attack results in a full compromise of the affected server, with high impact to confidentiality, integrity, and availability. The issue affects Oracle Mobile Application Server versions 12.2.3 through 12.2.15 and carries a CVSS 3.1 base score of 8.1 (High).

Technical details

  • Root cause: A weakness in the MWA Terminal Server component of Oracle Mobile Application Server that can be leveraged to gain unauthorized, complete control of the server process.
  • Trigger conditions: The vulnerability requires only network (TCP) access to the exposed MWA Terminal Server service — no authentication and no user interaction are needed. Oracle notes the attack complexity is high, meaning exploitation requires specific conditions or effort beyond simply reaching the service.
  • Attack vector: Network (remote), over TCP, with no privileges required (PR:N) and no user interaction (UI:N).
  • Impact: Successful exploitation results in complete compromise of the Oracle Mobile Application Server host — high impact to confidentiality, integrity, and availability (C:H/I:H/A:H) — effectively a total takeover of the affected system.

Affected software

  • Oracle Mobile Application Server (Oracle E-Business Suite component) — versions 12.2.3 through 12.2.15

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/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 Patch Update / Security Alert for Oracle E-Business Suite, which addresses CVE-2026-83464 for Oracle Mobile Application Server versions 12.2.3 through 12.2.15. Organizations should update to the version specified by Oracle for their release line as soon as possible.
  • If immediate patching is not possible: Restrict network access to the MWA Terminal Server component (e.g., via firewall rules, network segmentation, or VPN) so that it is not reachable from untrusted networks, and monitor for anomalous TCP connections to the service until the patch can be applied. Oracle strongly recommends applying the official fix rather than relying on workarounds, as this vulnerability may be remotely exploitable without authentication.

References

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