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CVE-2026-83042 – Unauthenticated RCE / Full System Compromise – Oracle Identity Manager 12.2.1.4.0 a

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Summary

CVE-2026-83042 is a critical, unauthenticated remote code execution vulnerability in the Oracle Identity Manager (OIM) Legacy UI component of Oracle Fusion Middleware. Oracle rates the flaw as "easily exploitable," allowing an unauthenticated attacker with network access via HTTP to fully compromise Oracle Identity Manager, potentially resulting in complete takeover of the host. The vulnerability was disclosed by Oracle on September 15, 2026, as part of the September 2026 Critical Security Patch Update (CSPU), with a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: A flaw in the OIM Legacy UI component of Oracle Identity Manager that can be reached over HTTP without any authentication.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable component must be network-accessible.
  • Attack vector: Network (AV:N) — exploitable remotely over HTTP with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: Successful exploitation results in high impact to confidentiality, integrity, and availability (C:H/I:H/A:H), consistent with Oracle’s description of "complete compromise" and potential full takeover of Oracle Identity Manager.
  • Scope: Unchanged (S:U).

Affected software

  • Oracle Identity Manager, version 12.2.1.4.0
  • Oracle Identity Manager, version 14.1.2.1.0

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 Oracle Identity Manager patches released in the Oracle Critical Security Patch Update (CSPU) – September 2026, published on the Oracle Fusion Middleware Patch Availability Document, for both affected versions (12.2.1.4.0 and 14.1.2.1.0). Oracle strongly recommends applying the patches without delay, as it has previously observed active exploitation of unpatched Fusion Middleware/Identity Manager vulnerabilities.
  • If immediate patching is not possible: Restrict network access to Oracle Identity Manager’s OIM Legacy UI/HTTP interfaces to trusted internal networks only, and avoid exposing the Identity Manager management interfaces directly to the internet until the patch is applied.
  • General guidance: Remain on actively supported Oracle Fusion Middleware/Identity Manager versions, since Oracle does not provide security patches for unsupported releases, and monitor for indicators of compromise on internet-facing Identity Manager deployments.

References

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