CVE-2026-87133: Oracle Hyperion DRM Auth Bypass Vulnerability

CVE-2026-87133 Overview

CVE-2026-87133 is a vulnerability in the Access and Security component of Oracle Hyperion Data Relationship Management. The affected supported version is 11.2.26.0.000. An authenticated attacker with high privileges and network access over HTTP can compromise the application. Successful exploitation results in unauthorized access to critical data and unauthorized modification of some accessible data. The vulnerability carries a scope change, meaning attacks may impact additional products beyond Oracle Hyperion Data Relationship Management itself. Oracle addressed the issue in its September 2026 Critical Patch Update.

Critical Impact
An authenticated attacker over the network can gain complete read access to Oracle Hyperion Data Relationship Management data and partial write access, with impact extending beyond the vulnerable component due to a security scope change.

Affected Products

Oracle Hyperion Data Relationship Management 11.2.26.0.000
Oracle Hyperion product family (Access and security component)
Deployments exposing Hyperion Data Relationship Management over HTTP

Discovery Timeline

2026-09-15 - CVE-2026-87133 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database
2026-09-16 - EPSS score published at approximately 0.34%

Technical Details for CVE-2026-87133

Vulnerability Analysis

The vulnerability resides in the Access and Security component of Oracle Hyperion Data Relationship Management (DRM). DRM manages master data hierarchies used for financial consolidation, reporting, and analytics. A flaw in access enforcement allows an authenticated actor with elevated privileges to bypass intended security boundaries. The scope change indicator signals that exploitation crosses a trust boundary, affecting resources beyond the vulnerable component. Confidentiality impact is rated high, integrity impact is limited, and availability is unaffected. Oracle categorizes the issue as easily exploitable when the attacker already holds high privileges within the environment.

Root Cause

Oracle has not publicly detailed the underlying defect. Based on the vulnerable component and the impact profile, the root cause is a broken access control condition in the Access and Security subsystem that governs authorization decisions for DRM resources. The defect enables an authorized user to read data outside their intended entitlements and modify a subset of accessible data. Refer to the Oracle Security Alert for authoritative details.

Attack Vector

Exploitation requires network access to the DRM HTTP interface and valid high-privileged credentials. No user interaction is required. The attacker sends crafted HTTP requests to the Access and Security component to trigger the flawed authorization logic. Because the scope changes, the impact reaches data or products beyond DRM itself. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, and no public exploit is available at this time.

No verified proof-of-concept code has been published. Oracle discloses component-level details only in its Critical Patch Update advisories.

Detection Methods for CVE-2026-87133

Indicators of Compromise

Unexpected HTTP requests to Oracle Hyperion Data Relationship Management endpoints from privileged accounts outside normal working hours.
Access attempts by administrative accounts to DRM hierarchies or nodes not previously touched by that identity.
Audit log entries showing successful authorization for operations that historically returned access-denied responses.

Detection Strategies

Enable and centralize DRM application audit logging, focusing on Access and Security component events and authorization decisions.
Baseline privileged user behavior in DRM and alert on deviations such as bulk data reads or hierarchy modifications.
Correlate web server access logs with DRM audit trails to identify HTTP request patterns that precede unusual data access.

Monitoring Recommendations

Forward DRM, WebLogic, and OS-level logs to a SIEM for long-term retention and cross-source correlation.
Monitor privileged account provisioning and reuse across Oracle Hyperion products for lateral movement indicators.
Track outbound data transfers from DRM hosts to detect potential exfiltration following unauthorized read access.

How to Mitigate CVE-2026-87133

Immediate Actions Required

Apply the Oracle September 2026 Critical Patch Update fixes for Oracle Hyperion Data Relationship Management as documented in the Oracle Security Alert.
Inventory all Oracle Hyperion Data Relationship Management installations and confirm whether version 11.2.26.0.000 is deployed.
Review and reduce the number of high-privileged accounts with access to DRM to shrink the exploitable population.
Rotate credentials for administrative DRM accounts and enforce multi-factor authentication where supported.

Patch Information

Oracle released fixes as part of the September 2026 Critical Patch Update. Administrators should download and apply the corresponding DRM patch from My Oracle Support. Consult the Oracle Security Alert for the exact patch identifiers, prerequisites, and post-installation steps.

Workarounds

Restrict network access to the DRM HTTP interface using firewall rules or a reverse proxy that allow-lists trusted administrative networks.
Apply least-privilege principles to DRM roles, removing unnecessary high-privilege grants until patching is complete.
Increase audit logging verbosity for the Access and Security component to improve detection while a patch window is scheduled.

bash

# Example: restrict inbound access to the DRM HTTP interface with iptables
# Replace 10.0.0.0/24 with the trusted administrative network
iptables -A INPUT -p tcp --dport 5240 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5240 -j DROP