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CVE-2026-61018 – Unauthenticated Remote Takeover (RCE) – Oracle WebCenter Sites 12.2.1.4.0 and 14.1.

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Summary

CVE-2026-61018 is a critical, unauthenticated remote compromise vulnerability in Oracle WebCenter Sites, a component of Oracle Fusion Middleware. The flaw allows an attacker with mere network access over HTTP — no credentials and no user interaction — to fully take over an affected WebCenter Sites instance. Oracle rates the issue 9.8 (Critical) on the CVSS v3.1 scale, its second-highest possible severity tier, reflecting complete loss of confidentiality, integrity, and availability.

Technical details

  • Root cause: Oracle’s advisory describes the flaw generically as a vulnerability in the WebCenter Sites component of Fusion Middleware; Oracle has not published low-level root-cause detail (e.g., specific class/endpoint) beyond confirming it is remotely and easily exploitable over HTTP.
  • Trigger conditions: The vulnerability is reachable by any network-positioned attacker able to send HTTP requests to the exposed WebCenter Sites application — no authentication or prior access is required.
  • 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 WebCenter Sites instance, with high impact to confidentiality, integrity, and availability — effectively equivalent to full compromise of the application and the data it manages.
  • Scope: Unchanged (S:U) — the impact is confined to the vulnerable WebCenter Sites component itself, per Oracle’s CVSS vector.

Affected software

  • Oracle WebCenter Sites version 12.2.1.4.0
  • Oracle WebCenter Sites version 14.1.2.0.0

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 Oracle Security Patch Update that addresses CVE-2026-61018 for the affected 12.2.1.4.0 and 14.1.2.0.0 releases, as published in Oracle’s Critical Security Patch Update advisory. Organizations should treat this as a priority-one patch given the unauthenticated, network-exploitable nature of the flaw and the "complete takeover" impact described by Oracle.
  • If immediate patching is not possible: Restrict network exposure of WebCenter Sites — ensure the application and its management interfaces are not directly reachable from the public internet, place it behind a WAF/reverse proxy with strict access controls, and limit inbound HTTP access to trusted networks only until the patch can be applied.
  • Ongoing: Monitor WebCenter Sites access logs for anomalous or unauthenticated request patterns, and verify patch deployment across all instances (including staging/DR environments) since the vulnerability affects both supported version lines.

References

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