CVE-2026-61259 Overview
CVE-2026-61259 is a high-severity access control vulnerability in Oracle Hyperion Calculation Manager, a component of the Oracle Hyperion enterprise performance management suite. The flaw resides in the Security component of version 11.2.25.0.000. A low-privileged attacker with network access via HTTP can exploit this vulnerability to gain unauthorized access to sensitive data. Successful exploitation can also cause a partial denial of service condition. The vulnerability is categorized under CWE-284: Improper Access Control.
Critical Impact
Unauthorized access to all Oracle Hyperion Calculation Manager accessible data and partial denial of service against the application.
Affected Products
- Oracle Hyperion Calculation Manager 11.2.25.0.000
- Oracle Hyperion (Security component)
- Enterprise Performance Management deployments running the affected Hyperion release
Discovery Timeline
- 2026-08-18 - CVE-2026-61259 published to NVD
- 2026-08-18 - Oracle published the associated Oracle Security Alert
- 2026-08-20 - Last updated in NVD database
Technical Details for CVE-2026-61259
Vulnerability Analysis
The vulnerability affects the Security component of Oracle Hyperion Calculation Manager. Oracle classifies it as easily exploitable, requiring only low-level privileges and network access over HTTP. No user interaction is required to trigger the flaw. Successful exploitation yields high confidentiality impact and low availability impact, with no integrity impact recorded. The scope remains unchanged, meaning the compromise stays within the vulnerable component but exposes all data accessible to it.
Attackers who obtain valid low-privilege application credentials can escalate their read access across Calculation Manager data structures. This includes financial models, calculation rules, and business logic configurations stored within the Hyperion environment. The partial denial-of-service outcome suggests the same code path can be abused to degrade service availability for legitimate users.
Root Cause
The root cause is improper access control [CWE-284] within the Security component of Calculation Manager. Authorization checks fail to correctly restrict what a low-privileged authenticated user can read or invoke. Because the vulnerable interfaces are exposed over HTTP, the flaw is reachable from any network position that can reach the application server.
Attack Vector
Exploitation requires network access to the Hyperion Calculation Manager HTTP endpoints and a valid low-privileged account. An attacker authenticates with minimal privileges, then issues crafted HTTP requests to interfaces protected by the flawed authorization logic. The requests return data that should be restricted to higher-privileged roles. Repeated abuse of the same interface can degrade service availability. Technical details are limited to the vendor bulletin; see the Oracle Security Alert for the vendor advisory.
Detection Methods for CVE-2026-61259
Indicators of Compromise
- Unexpected HTTP requests to Oracle Hyperion Calculation Manager endpoints from low-privileged user sessions accessing data outside their role scope.
- Application-level authorization denials followed shortly by successful access to the same resources from the same session.
- Anomalous volumes of read operations against Calculation Manager data by non-administrative accounts.
- Application slowdowns or intermittent unavailability correlated with sustained request patterns from a single low-privileged account.
Detection Strategies
- Monitor Hyperion application and web server logs for authenticated users accessing objects inconsistent with their assigned role in the Security component.
- Baseline normal Calculation Manager usage per role, then alert on deviations in the volume and type of accessed artifacts.
- Correlate authentication events with subsequent HTTP request patterns to identify horizontal or vertical privilege escalation attempts.
Monitoring Recommendations
- Enable verbose auditing on Oracle Hyperion Calculation Manager and forward logs to a centralized SIEM.
- Track HTTP 4xx and 5xx response spikes on Hyperion endpoints as potential denial-of-service indicators.
- Review privileged and low-privileged account activity daily until the patch is confirmed applied across all Hyperion nodes.
How to Mitigate CVE-2026-61259
Immediate Actions Required
- Apply the fixes referenced in the Oracle Security Alert for Oracle Hyperion Calculation Manager 11.2.25.0.000.
- Inventory all Hyperion Calculation Manager deployments and confirm the running version.
- Review and reduce the number of low-privileged accounts with network access to Calculation Manager HTTP endpoints.
- Rotate credentials for accounts that had access to Calculation Manager prior to patching.
Patch Information
Oracle addresses this vulnerability in the August 2026 Critical Patch Update. Administrators should consult the Oracle Security Alert for the exact patch identifiers and installation instructions applicable to version 11.2.25.0.000. Patching remains the only vendor-recommended remediation.
Workarounds
- Restrict network access to Hyperion Calculation Manager HTTP interfaces to trusted management networks using firewall or reverse proxy rules.
- Enforce least privilege on all Hyperion user accounts and remove unused low-privilege accounts.
- Place the application behind a web application firewall configured to rate-limit requests and detect authorization anomalies.
- Increase logging verbosity on the Security component to accelerate detection while the patch is being scheduled.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
