CVE-2026-87134: Oracle Hyperion DRM Auth Bypass Vulnerability

CVE-2026-87134 Overview

CVE-2026-87134 is a high-severity vulnerability in the Access and Security component of Oracle Hyperion Data Relationship Management. The affected version is 11.2.26.0.000. A low-privileged attacker with network access via TCP can exploit the flaw without user interaction. Successful exploitation grants unauthorized access to critical data across Oracle Hyperion Data Relationship Management. The vulnerability includes a scope change, meaning attacks can significantly impact additional products beyond the vulnerable component. Oracle published details in the Oracle Security Alert CSPU SEP 2026 advisory.

Critical Impact
Low-privileged network attackers can compromise confidentiality across Oracle Hyperion Data Relationship Management and impact adjacent products through scope change.

Affected Products

Oracle Hyperion Data Relationship Management 11.2.26.0.000
Oracle Hyperion product family (component: Access and security)
Downstream products impacted through scope change

Discovery Timeline

2026-09-15 - CVE-2026-87134 published to the National Vulnerability Database (NVD)
2026-09-15 - Oracle publishes Security Alert CSPU SEP 2026
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-87134

Vulnerability Analysis

The vulnerability resides in the Access and Security component of Oracle Hyperion Data Relationship Management. This component governs authorization and access enforcement for data managed by the platform. A flaw in this control path allows an authenticated but low-privileged attacker to reach data that should be restricted. The confidentiality impact is high, while integrity and availability remain unaffected. The scope change indicates that the vulnerable component and the impacted resources belong to different security authorities, extending the blast radius beyond Hyperion Data Relationship Management itself.

Root Cause

Oracle has not disclosed low-level technical details in the public advisory. Based on the CVSS metrics and component context, the root cause is an access control weakness in the Access and Security layer that fails to enforce authorization boundaries for authenticated sessions. This class of defect typically maps to broken access control patterns where identity is validated but resource-level authorization is not.

Attack Vector

An attacker requires network reachability to the Hyperion Data Relationship Management service over TCP and valid low-privileged credentials. No user interaction is required, and attack complexity is low. Once authenticated, the attacker issues requests that traverse the flawed authorization path to read data outside their assigned scope. The scope change permits the disclosure to include data owned by adjacent Oracle Hyperion services, widening the exposure to any integrated reporting or master data workloads.

No public proof-of-concept exploit code has been released. Refer to the Oracle Security Alert CSPU SEP 2026 for the authoritative technical description.

Detection Methods for CVE-2026-87134

Indicators of Compromise

Authenticated Hyperion Data Relationship Management sessions accessing dimension or hierarchy data outside the user's assigned application scope.
Unusual volumes of read or export operations performed by low-privileged accounts against master data records.
Cross-application data reads originating from a single Hyperion session, consistent with scope-change exploitation.

Detection Strategies

Baseline normal access patterns per role in Hyperion Data Relationship Management and alert on deviations from those baselines.
Correlate application logs with network flow records to identify low-privileged accounts issuing high-value data queries.
Enable and centralize Hyperion audit logs covering authentication, authorization decisions, and data export activities.

Monitoring Recommendations

Ingest Hyperion Data Relationship Management logs into a centralized SIEM or data lake for cross-source correlation.
Monitor TCP endpoints exposing the Hyperion service for unexpected client sources and off-hours activity.
Track privileged and low-privileged account activity separately, and alert on privilege boundary crossings.

How to Mitigate CVE-2026-87134

Immediate Actions Required

Apply the Oracle Critical Patch Update referenced in the Oracle Security Alert CSPU SEP 2026 to all instances of Oracle Hyperion Data Relationship Management 11.2.26.0.000.
Inventory all Hyperion Data Relationship Management deployments and confirm patch status for each.
Rotate credentials for low-privileged accounts that could have been abused prior to patching.
Review audit logs for unauthorized data access dating back to the disclosure window.

Patch Information

Oracle addressed CVE-2026-87134 in the September 2026 Critical Security Patch Update. Refer to the Oracle Security Alert CSPU SEP 2026 for the applicable patch bundles, prerequisites, and installation guidance for Oracle Hyperion Data Relationship Management 11.2.26.0.000.

Workarounds

Restrict network access to Hyperion Data Relationship Management TCP endpoints using firewall rules and allow lists limited to trusted management subnets.
Enforce least privilege on all Hyperion accounts and remove unused low-privileged accounts that could provide an attacker foothold.
Require multi-factor authentication for all Hyperion Data Relationship Management users to raise the cost of credential-based access.

bash

# Example: restrict Hyperion Data Relationship Management TCP access at the host firewall
# Replace <trusted_subnet> and <drm_port> with your environment values
iptables -A INPUT -p tcp --dport <drm_port> -s <trusted_subnet> -j ACCEPT
iptables -A INPUT -p tcp --dport <drm_port> -j DROP