CVE-2026-70677 Overview
CVE-2026-70677 is a security vulnerability in the Oracle Hyperion Calculation Manager product of Oracle Hyperion, within the Security component. The affected supported version is 11.2.25.0.000. An unauthenticated attacker with network access via HTTP can compromise Oracle Hyperion Calculation Manager, though the vulnerability is difficult to exploit and requires human interaction from a user other than the attacker.
Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle Hyperion Calculation Manager accessible data. It can also allow unauthorized update, insert, or delete access to a subset of accessible data.
Critical Impact
Unauthenticated network-based attack that, with user interaction, can lead to disclosure of all accessible Hyperion Calculation Manager data and partial data modification.
Affected Products
- Oracle Hyperion Calculation Manager 11.2.25.0.000
Discovery Timeline
- 2026-08-18 - CVE-2026-70677 published to NVD
- 2026-08-20 - Last updated in NVD database
Technical Details for CVE-2026-70677
Vulnerability Analysis
The vulnerability resides in the Security component of Oracle Hyperion Calculation Manager. An unauthenticated attacker can reach the affected functionality remotely over HTTP. Exploitation is not straightforward and depends on specific conditions being met on the target environment.
The attack requires human interaction from a user other than the attacker. This pattern is consistent with client-assisted exploitation, where a legitimate user must perform an action such as clicking a crafted link or loading attacker-controlled content while authenticated to the application.
Once triggered, the attacker gains high confidentiality impact and low integrity impact against the application. Availability is not impacted, indicating the flaw does not disrupt service continuity.
Root Cause
Oracle's advisory does not disclose the specific technical root cause. The impact profile, combined with the Security component classification and the requirement for user interaction, is consistent with a weakness in how the application processes attacker-influenced requests handled through a victim's authenticated session.
Attack Vector
The attack vector is network-based over HTTP. The attacker crafts a malicious request or content and relies on a legitimate Hyperion Calculation Manager user to interact with it. Successful exploitation grants the attacker unauthorized read access to all data accessible by that user and the ability to update, insert, or delete a subset of that data.
No verified proof-of-concept code is publicly available for CVE-2026-70677. Technical details are limited to the information published in the Oracle Security Alert.
Detection Methods for CVE-2026-70677
Indicators of Compromise
- Unexpected HTTP requests to Oracle Hyperion Calculation Manager endpoints originating from external referrers or unusual user-agents.
- Application or web server log entries showing authenticated actions performed shortly after a user followed an external link.
- Anomalous read, update, insert, or delete operations against Calculation Manager data outside of normal business workflows.
Detection Strategies
- Correlate web server access logs with authentication logs to identify requests where the referrer or session context does not match expected user workflows.
- Baseline normal Calculation Manager API and UI usage patterns per user, and alert on deviations in data access volume or modification actions.
- Inspect outbound email and messaging channels for links pointing to Hyperion hosts that originate from untrusted senders.
Monitoring Recommendations
- Forward Oracle Hyperion application, middleware, and web server logs to a centralized analytics platform for correlation.
- Monitor privileged Calculation Manager accounts for unusual data export or bulk modification activity.
- Track EPSS movement for CVE-2026-70677, currently 0.24%, as an early signal of shifting exploitation likelihood.
How to Mitigate CVE-2026-70677
Immediate Actions Required
- Inventory all Oracle Hyperion Calculation Manager deployments and confirm which are running version 11.2.25.0.000.
- Apply the fix identified in the Oracle Critical Patch Update referenced by the Oracle Security Alert.
- Restrict network access to Hyperion Calculation Manager to trusted internal networks and VPN users only.
Patch Information
Oracle addresses this vulnerability in the security update referenced by the Oracle Security Alert. Administrators should follow Oracle's documented patch procedure for Hyperion Calculation Manager 11.2.25.0.000 and validate application functionality after deployment.
Workarounds
- Place Hyperion Calculation Manager behind a web application firewall configured to inspect and filter cross-origin and referrer-anomalous requests.
- Enforce strict browser session policies for Hyperion users, including short session timeouts and separate browser profiles for administrative work.
- Deliver user awareness guidance instructing Hyperion users to avoid following untrusted links while authenticated to the application.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
