CVE-2026-70891 Overview
CVE-2026-70891 is a broken access control vulnerability in Oracle Hyperion Data Relationship Management, affecting the Access and Security component. The flaw exists in version 11.2.25.0.000 and allows an unauthenticated remote attacker to compromise confidentiality over HTTP. Successful exploitation yields unauthorized access to critical data or complete disclosure of all data accessible to the application. The vulnerability maps to CWE-284: Improper Access Control and requires no user interaction. Oracle addressed the issue in the August 2026 Critical Patch Update.
Critical Impact
An unauthenticated network attacker can obtain full read access to sensitive master data managed by Oracle Hyperion Data Relationship Management.
Affected Products
- Oracle Hyperion Data Relationship Management 11.2.25.0.000
- Oracle Hyperion product family (Access and Security component)
Discovery Timeline
- 2026-08-18 - CVE-2026-70891 published to the National Vulnerability Database
- 2026-08-22 - Last updated in NVD database
Technical Details for CVE-2026-70891
Vulnerability Analysis
Oracle Hyperion Data Relationship Management (DRM) centralizes enterprise master data governance across finance, planning, and consolidation systems. The Access and Security component enforces authentication and authorization boundaries around this data. CVE-2026-70891 breaks that boundary, letting a remote attacker reach protected resources without valid credentials.
The vulnerability results in confidentiality-only impact. Integrity and availability of the target system remain unaffected, but the exposed data can include hierarchy structures, financial master data, and account mappings that support downstream compromise or fraud.
Oracle classifies the flaw as easily exploitable over HTTP. No prerequisite privileges, tokens, or user interaction are required, and the scope remains unchanged within the Hyperion DRM security context.
Root Cause
The defect falls under CWE-284: Improper Access Control. The Access and Security component fails to correctly validate authorization on one or more HTTP-reachable endpoints. Oracle has not published implementation-level detail beyond the Oracle Security Alert.
Attack Vector
Exploitation occurs over the network via HTTP against a Hyperion DRM instance. An attacker sends crafted requests to a vulnerable endpoint and receives data that should require authenticated, authorized access. No client-side interaction is required, which makes the vulnerability suitable for automated scanning and mass exploitation once request patterns become public.
No public proof-of-concept, exploit code, or CISA KEV listing is available at the time of publication. The EPSS score is 0.394%.
See the Oracle Security Alert for August 2026 for vendor-supplied technical details.
Detection Methods for CVE-2026-70891
Indicators of Compromise
- Unauthenticated HTTP requests to Hyperion DRM application endpoints returning 200 OK with data payloads.
- Application or web-tier logs showing access to protected DRM URIs without a preceding authenticated session.
- Anomalous outbound data volume from Hyperion DRM web servers to external IP addresses.
Detection Strategies
- Baseline expected authenticated traffic to the Hyperion DRM web tier and alert on sessions that access data endpoints without a login event.
- Deploy web application firewall rules that flag requests to Hyperion DRM data endpoints missing valid session cookies or authorization headers.
- Correlate HTTP access logs with authentication server logs to surface requests that bypass the login flow.
Monitoring Recommendations
- Enable verbose audit logging on the Hyperion DRM Access and Security component and forward logs to a centralized SIEM.
- Monitor for scanning patterns against Hyperion URIs, including requests from cloud-hosted or anonymizing infrastructure.
- Track user-agent strings and request rates for signs of automated enumeration of DRM endpoints.
How to Mitigate CVE-2026-70891
Immediate Actions Required
- Apply the fixes from the Oracle Critical Patch Update August 2026 to all Hyperion Data Relationship Management 11.2.25.0.000 instances.
- Restrict network exposure of Hyperion DRM web interfaces to trusted internal networks and VPN clients only.
- Review web and application logs for signs of unauthenticated access to DRM data endpoints prior to patching.
Patch Information
Oracle released fixes as part of the August 2026 Critical Patch Update. Administrators should follow Oracle's documented patching procedure for Hyperion DRM and validate installation with post-patch smoke tests. Full details are available in the Oracle Security Alert.
Workarounds
- Place Hyperion DRM behind a reverse proxy or WAF that enforces authentication before requests reach the application tier.
- Apply network segmentation and firewall rules that limit HTTP access to authorized administrator and analyst subnets.
- Disable or restrict any unused Hyperion DRM web endpoints until the patch is applied.
# Example: restrict HTTP access to Hyperion DRM to a management subnet
iptables -A INPUT -p tcp --dport 5240 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5240 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
