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CVE-2026-83462 – Unauthenticated Remote Takeover (RCE) – Oracle Mobile Application Server (MWA Termi

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Summary

CVE-2026-83462 is a critical vulnerability in the MWA Terminal Server component of Oracle Mobile Application Server (part of Oracle E-Business Suite). The flaw allows an unauthenticated, remote attacker with network access via TCP to fully compromise the affected server. Oracle rates this issue CRITICAL with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: A flaw in the MWA (Mobile Application) Terminal Server component of Oracle Mobile Application Server that permits unauthenticated compromise of the host.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network (TCP) reachability to the exposed MWA Terminal Server service.
  • Attack vector: Network (AV:N) — exploitable remotely over TCP with low attack complexity and no privileges required.
  • Impact: Successful exploitation results in complete takeover of Oracle Mobile Application Server, with full loss of confidentiality, integrity, and availability of the affected system.

Affected software

  • Oracle Mobile Application Server (Oracle E-Business Suite component: MWA Terminal Server), versions 12.2.3 through 12.2.15

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 Oracle’s official patch for this vulnerability, released as part of the September 2026 Critical Security Patch Update. Organizations running Oracle Mobile Application Server 12.2.3 through 12.2.15 should update to the fixed release referenced in Oracle’s advisory as soon as possible.
  • If patching cannot be applied immediately: Restrict network access to the MWA Terminal Server service to trusted internal hosts only, and block unauthenticated TCP access from untrusted or internet-facing networks until the patch can be deployed.

References

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