CVE-2026-70878: Oracle Hyperion DRM Auth Bypass Flaw

CVE-2026-70878 Overview

CVE-2026-70878 is a high-severity vulnerability in the Access and security component of Oracle Hyperion Data Relationship Management. The affected release is version 11.2.25.0.000. A low-privileged attacker with network access over HTTP can exploit the flaw without user interaction. Successful exploitation allows unauthorized creation, deletion, or modification of critical data, along with unauthorized read access to all data accessible through Hyperion Data Relationship Management. Oracle disclosed the issue in its August 2026 Critical Patch Update Security Alert.

Critical Impact
Authenticated attackers with only low privileges can compromise the confidentiality and integrity of every record managed by Oracle Hyperion Data Relationship Management over the network.

Affected Products

Oracle Hyperion Data Relationship Management 11.2.25.0.000
Oracle Hyperion product family (Access and security component)
Deployments exposing the Hyperion Data Relationship Management web interface over HTTP

Discovery Timeline

2026-08-18 - CVE-2026-70878 published to the National Vulnerability Database
2026-08-20 - Entry last modified in the NVD database
August 2026 - Oracle publishes the Oracle Security Alert covering this issue

Technical Details for CVE-2026-70878

Vulnerability Analysis

The flaw resides in the Access and security component of Oracle Hyperion Data Relationship Management. This component enforces authentication, authorization, and role-based access to master data hierarchies. A failure in that enforcement logic lets a low-privileged authenticated user perform operations outside of their assigned role. The result is broken access control against the master data governance layer used for financial and regulatory reporting.

Oracle's advisory classifies the issue as easily exploitable. It requires no user interaction and does not cross a security scope boundary. Confidentiality and integrity impacts are rated High while availability is not affected. The EPSS model currently places exploitation likelihood at 0.392% within the 32.6th percentile.

Root Cause

Oracle has not published a code-level root cause. Based on the advisory description, the underlying weakness is an authorization enforcement gap in the Access and security module. Requests from authenticated users are processed without adequate verification that the caller holds the required privilege for the target object or action. This aligns with the broken access control class of vulnerabilities.

Attack Vector

Exploitation is remote over the network via HTTP. The attacker must first authenticate with a low-privileged account, which can be any valid Hyperion user. Once authenticated, the attacker issues crafted HTTP requests against the Hyperion Data Relationship Management application. The server processes the requests as if the caller were authorized, exposing critical data and allowing unauthorized create, update, and delete operations across the application's data scope.

No verified public proof-of-concept code is available. Refer to the Oracle Security Alert for vendor-supplied technical details.

Detection Methods for CVE-2026-70878

Indicators of Compromise

Authenticated HTTP sessions from low-privileged Hyperion accounts issuing administrative or bulk data-modification requests.
Unexpected create, delete, or modify actions in Hyperion Data Relationship Management audit logs, especially against hierarchies the user does not own.
Access to Data Relationship Management API endpoints or web pages that fall outside the user's assigned role.
Spikes in HTTP requests to Hyperion endpoints from a single session or source IP.

Detection Strategies

Enable and centralize application audit logging for Hyperion Data Relationship Management, focusing on data modifications and permission checks.
Correlate web server access logs with application-level role assignments to flag privilege mismatches.
Baseline typical usage per role and alert on deviations such as low-privileged users invoking administrative functions.
Ingest Hyperion and web tier logs into a SIEM to build detections for suspicious sequences of HTTP actions.

Monitoring Recommendations

Monitor for authentication from service or dormant accounts followed by data modification activity.
Track outbound data volumes from Hyperion application servers to identify possible bulk exfiltration.
Alert on configuration or metadata changes to critical hierarchies outside of approved change windows.
Review Oracle Identity and Access Management logs for anomalous privilege grants preceding Hyperion activity.

How to Mitigate CVE-2026-70878

Immediate Actions Required

Apply the fixes published in the Oracle August 2026 Critical Patch Update Security Alert to all Hyperion Data Relationship Management 11.2.25.0.000 deployments.
Inventory every Hyperion Data Relationship Management instance, including non-production environments, and confirm patch status.
Rotate credentials for low-privileged Hyperion accounts and review recent role assignments for anomalies.
Restrict network reachability of the Hyperion Data Relationship Management web tier to trusted management networks and VPNs.

Patch Information

Oracle addresses CVE-2026-70878 through the August 2026 Critical Patch Update. Administrators should download and apply the patch bundle from My Oracle Support that corresponds to Hyperion Data Relationship Management 11.2.25.0.000. Follow Oracle's documented patch procedure, including pre-patch backups of the application database and configuration files, and validate application functionality after installation.

Workarounds

Reduce the population of accounts holding any Hyperion Data Relationship Management access to the minimum required for operations.
Place the Hyperion Data Relationship Management web interface behind a reverse proxy or web application firewall that enforces strong authentication and rate limiting.
Disable or restrict remote HTTP access until patches are applied, allowing only jump hosts or bastion access.
Increase audit log retention and review frequency for the Access and security component during the remediation window.

bash

# Example: restrict access to the Hyperion DRM web tier at the network layer
# Replace 10.0.0.0/24 with your trusted administrative subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP