CVE-2026-70751: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-70751 Overview

CVE-2026-70751 affects the Server component of Oracle Hyperion Financial Reporting, specifically version 11.2.25.0.000. The vulnerability allows an unauthenticated attacker with network access via HTTP to compromise the application, but requires user interaction from a person other than the attacker. Successful exploitation results in unauthorized creation, deletion, or modification of data, along with unauthorized read access to all data accessible by Oracle Hyperion Financial Reporting. Oracle disclosed the issue in its August 2026 Critical Patch Update.

Critical Impact
An unauthenticated remote attacker who convinces a user to interact with a malicious request can compromise the confidentiality and integrity of all data accessible to Oracle Hyperion Financial Reporting.

Affected Products

Oracle Hyperion Financial Reporting
Oracle Hyperion (Server component)
Version 11.2.25.0.000

Discovery Timeline

2026-08-18 - CVE-2026-70751 published to NVD
2026-08-18 - Oracle publishes the Oracle Security Alert August 2026
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-70751

Vulnerability Analysis

The vulnerability resides in the Server component of Oracle Hyperion Financial Reporting. An attacker communicates with the vulnerable server over HTTP without authenticating. Exploitation is rated difficult and depends on tricking a legitimate user to perform an action, such as clicking a crafted link or loading attacker-controlled content in an authenticated context.

When exploited, the flaw grants an attacker the ability to read, modify, create, or delete all data reachable by Oracle Hyperion Financial Reporting. Availability of the service is not directly impacted. Because Hyperion Financial Reporting handles financial statements and disclosures, the integrity impact can influence downstream reporting and audit trails.

Root Cause

Oracle has not published the underlying weakness class or CWE. Based on the CVSS attributes — network vector, high attack complexity, no privileges required, and required user interaction — the flaw is consistent with client-assisted server-side abuse patterns in web-facing enterprise reporting servers. Refer to the Oracle Security Alert August 2026 for vendor-supplied technical detail.

Attack Vector

Exploitation follows this pattern:

The attacker crafts an HTTP payload targeting the Hyperion Financial Reporting Server endpoint.
The attacker lures an authenticated Hyperion user to trigger the request, for example through a phishing link or an embedded resource.
The server processes the request in the user's context and exposes or alters reporting data.

No credentials are needed by the attacker directly, but the interaction step by another user is mandatory. Public proof-of-concept code is not available at the time of publication.

Detection Methods for CVE-2026-70751

Indicators of Compromise

Unexpected HTTP POST or GET requests to Hyperion Financial Reporting Server endpoints originating from external referrers or unusual user agents.
Modification, creation, or deletion of financial reports outside of scheduled reporting windows.
Authenticated Hyperion sessions performing bulk data reads shortly after users click external links.

Detection Strategies

Monitor Hyperion application and web server logs for anomalous request patterns targeting reporting endpoints.
Correlate user browser activity (email clicks, external navigation) with subsequent Hyperion Financial Reporting API calls.
Alert on report definition changes, permission changes, or export operations that deviate from baseline behavior.

Monitoring Recommendations

Forward Hyperion Financial Reporting server logs, web proxy logs, and endpoint telemetry to a central SIEM for correlation.
Track outbound network connections from Hyperion servers to unexpected destinations following user-driven HTTP requests.
Baseline normal reporting workflows and generate detections for deviations in report access frequency or scope.

How to Mitigate CVE-2026-70751

Immediate Actions Required

Apply the fixes described in the Oracle Security Alert August 2026 to Oracle Hyperion Financial Reporting version 11.2.25.0.000.
Restrict network access to Hyperion Financial Reporting Server interfaces to trusted internal networks only.
Enforce user awareness training focused on phishing, since exploitation requires user interaction.

Patch Information

Oracle addressed CVE-2026-70751 in the August 2026 Critical Patch Update. Administrators should review the Oracle Security Alert August 2026 advisory and apply the vendor-supplied patch for Oracle Hyperion Financial Reporting 11.2.25.0.000.

Workarounds

Place Hyperion Financial Reporting behind a web application firewall configured to inspect and filter HTTP requests to reporting endpoints.
Require VPN or zero-trust network access for all Hyperion users to reduce exposure to unauthenticated HTTP requests.
Limit browser sessions that hold active Hyperion authentication from browsing untrusted external content.