CVE-2026-70789: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-70789 Overview

CVE-2026-70789 is a vulnerability in the Oracle Hyperion Financial Reporting product of Oracle Hyperion, affecting the Server component. The supported version affected is 11.2.25.0.000. An unauthenticated attacker with network access via HTTP can exploit the flaw, though exploitation is difficult and requires human interaction from a user other than the attacker. Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle Hyperion Financial Reporting accessible data, along with unauthorized update, insert, or delete access to some accessible data.

Critical Impact
Successful attacks can compromise confidentiality of all Oracle Hyperion Financial Reporting accessible data and enable limited unauthorized modification of that data.

Affected Products

Oracle Hyperion Financial Reporting 11.2.25.0.000
Oracle Hyperion product family (Server component)
Deployments exposing the Hyperion Financial Reporting Server over HTTP

Discovery Timeline

2026-08-18 - CVE-2026-70789 published to the National Vulnerability Database (NVD)
2026-08-20 - Last updated in the NVD database
2026-08-20 - EPSS score published at 0.193%

Technical Details for CVE-2026-70789

Vulnerability Analysis

The vulnerability resides in the Server component of Oracle Hyperion Financial Reporting version 11.2.25.0.000. A remote, unauthenticated attacker can reach the affected server over HTTP and trigger the flaw when a legitimate user interacts with attacker-supplied content. Exploitation is not straightforward and depends on specific runtime conditions plus the required user interaction, which raises attack complexity. When these conditions align, an attacker can read sensitive financial reporting data and modify a subset of the application's data.

Oracle categorizes the impact as high confidentiality loss and low integrity loss with no availability impact. The vulnerability scope remains unchanged, meaning the attacker's actions are constrained to the vulnerable component's security context. The published EPSS score of 0.193% (percentile 9.406) indicates low near-term exploitation probability, but exposure of the Hyperion server to untrusted networks materially increases risk.

Root Cause

Oracle's advisory does not publicly enumerate the underlying weakness, and no Common Weakness Enumeration (CWE) identifier is assigned. The vector requires user interaction and delivers a confidentiality-focused impact, patterns consistent with server-side handling of attacker-influenced content processed on behalf of an authenticated user. Refer to the Oracle Security Alert CSPUAUG2026 for authoritative technical detail.

Attack Vector

The attacker delivers a crafted HTTP request or link to the Oracle Hyperion Financial Reporting Server. A user other than the attacker must interact with the malicious content for the exploit chain to succeed. Once triggered, the server processes attacker-controlled input in a manner that exposes sensitive reporting data and permits limited unauthorized writes. No credentials are required, and the network is the entry point.

No verified proof-of-concept code is available. See the Oracle Security Alert CSPUAUG2026 for vendor-authoritative technical details.

Detection Methods for CVE-2026-70789

Indicators of Compromise

Unusual HTTP requests to Oracle Hyperion Financial Reporting Server endpoints originating from untrusted networks.
Report exports, queries, or data modifications initiated shortly after users click external links or open attachments referencing the Hyperion server.
Anomalous authenticated session activity where a legitimate user's session performs unexpected read or write operations against financial reporting datasets.

Detection Strategies

Baseline normal HTTP traffic to the Hyperion Financial Reporting Server and alert on deviations in request patterns, referrers, and User-Agent strings.
Correlate web proxy logs with endpoint telemetry to identify users redirected to Hyperion URLs from external email, chat, or web sources.
Monitor Hyperion audit logs for read access to sensitive reports and for unauthorized inserts, updates, or deletes tied to interactive user sessions.

Monitoring Recommendations

Enable verbose HTTP access logging on the Hyperion server and forward logs to a centralized SIEM for retention and correlation.
Track outbound and inbound traffic to the Hyperion tier using network detection tools that can flag unexpected external referrers.
Alert on privileged financial data operations occurring outside standard reporting windows or from atypical client sessions.

How to Mitigate CVE-2026-70789

Immediate Actions Required

Apply the fixes described in the Oracle Security Alert CSPUAUG2026 as soon as they can be tested in your environment.
Restrict network exposure of the Hyperion Financial Reporting Server so that only trusted internal networks and VPN clients can reach the HTTP interface.
Brief report authors and finance users on the risk of clicking Hyperion links delivered through email or messaging without verification.

Patch Information

Oracle addresses this vulnerability through the Critical Patch Update referenced in Oracle Security Alert CSPUAUG2026. Administrators running Oracle Hyperion Financial Reporting 11.2.25.0.000 should review the alert, identify the applicable patch bundle, and schedule deployment following Oracle's guidance and their internal change management procedures.

Workarounds

Place the Hyperion Financial Reporting Server behind a reverse proxy or web application firewall that enforces strict URL and content filtering.
Enforce network segmentation to prevent direct HTTP access from user endpoints and untrusted zones to the Hyperion server.
Require multi-factor authentication and short session lifetimes for accounts with access to Hyperion Financial Reporting to reduce the value of session abuse.

bash

# Example: restrict inbound HTTP to the Hyperion server to a trusted management subnet
iptables -A INPUT -p tcp --dport 19000 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 19000 -j DROP