CVE-2026-87136 Overview
CVE-2026-87136 affects the Oracle Hyperion Data Relationship Management product within the Oracle Hyperion suite. The flaw resides in the Access and security component of version 11.2.26.0.000. An unauthenticated attacker with network access over HTTP can exploit this weakness to gain unauthorized access to sensitive data. Successful exploitation grants read access to all data managed by Oracle Hyperion Data Relationship Management. The vulnerability requires no user interaction and no privileges, making it trivial to weaponize against exposed instances.
Critical Impact
Remote unauthenticated attackers can obtain complete access to all data accessible through Oracle Hyperion Data Relationship Management over HTTP.
Affected Products
- Oracle Hyperion Data Relationship Management 11.2.26.0.000
- Oracle Hyperion (Access and security component)
- Deployments exposing the Hyperion DRM web interface over HTTP
Discovery Timeline
- 2026-09-15 - CVE-2026-87136 published to NVD
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-87136
Vulnerability Analysis
CVE-2026-87136 is an information disclosure vulnerability in the Access and security component of Oracle Hyperion Data Relationship Management (DRM). Oracle Hyperion DRM manages master data governance for finance and enterprise performance management workloads. The affected component enforces authentication and authorization for DRM resources served over HTTP.
The flaw allows an unauthenticated attacker on the network to bypass access controls and read data protected by the DRM instance. Because DRM stores hierarchies, financial metadata, chart-of-accounts information, and mapping structures, exposed data may include business-sensitive records. The exploitation path targets network-reachable HTTP endpoints and does not require any prior foothold.
Root Cause
Oracle has not disclosed low-level technical details. Based on Oracle's advisory, the root cause resides in the Access and security component's handling of unauthenticated HTTP requests. The component fails to enforce authentication on operations that return confidentiality-sensitive data, categorizing this as broken access control.
Attack Vector
The attack vector is network-based over HTTP. An attacker sends crafted HTTP requests to an exposed Hyperion DRM instance and receives protected data in the response. No credentials, tokens, or user interaction are required. Internet-exposed DRM deployments face the highest risk, but any attacker with reachability to the DRM HTTP service on internal networks can execute the attack.
See the Oracle Security Alert CSPUSEP2026 for vendor-published technical context.
Detection Methods for CVE-2026-87136
Indicators of Compromise
- Unauthenticated HTTP requests to Hyperion DRM endpoints returning 200 OK responses with data payloads
- Anomalous volume of outbound data from Hyperion DRM servers to untrusted source IPs
- HTTP access log entries from unfamiliar user agents or geolocations targeting DRM URIs
- Requests to DRM API paths without preceding authentication handshake events
Detection Strategies
- Inspect Hyperion DRM web server access logs for requests that succeed without corresponding session or authentication events
- Correlate DRM HTTP traffic with authentication logs to surface requests that bypass the login flow
- Deploy web application firewall rules that require authenticated session cookies on data-returning endpoints
- Monitor network flow telemetry for unusual response sizes from DRM servers to external hosts
Monitoring Recommendations
- Enable verbose HTTP access logging on all Hyperion DRM front-end servers and forward logs to a centralized SIEM
- Baseline normal request patterns to DRM endpoints and alert on deviations in method, path, or response size
- Track the EPSS score for CVE-2026-87136 (currently 0.316%) and re-prioritize as exploitation likelihood evolves
- Review Oracle Critical Patch Update advisories on a recurring cadence to catch related Hyperion disclosures
How to Mitigate CVE-2026-87136
Immediate Actions Required
- Identify all Oracle Hyperion Data Relationship Management deployments at version 11.2.26.0.000 across the environment
- Restrict network access to Hyperion DRM HTTP interfaces to trusted management networks only
- Apply the fixes referenced in the Oracle Security Alert CSPUSEP2026 as soon as they are available in your maintenance window
- Review DRM access logs for the preceding 90 days for evidence of unauthenticated data retrieval
Patch Information
Oracle addressed this vulnerability in the security alert bundle tracked as CSPUSEP2026. Apply the patches referenced in the Oracle Security Alert CSPUSEP2026 advisory for Oracle Hyperion Data Relationship Management version 11.2.26.0.000. Validate patch application by confirming the DRM component version and re-running access control tests against previously exposed endpoints.
Workarounds
- Place Hyperion DRM behind a reverse proxy or VPN that enforces authentication before requests reach the application
- Block external network access to DRM HTTP endpoints using firewall rules until patches are applied
- Enforce IP allowlisting on the DRM web tier to limit reachability to known administrative hosts
- Disable or shut down non-essential DRM instances that are not actively required for business operations
# Example: restrict inbound HTTP access to Hyperion DRM to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
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