CVE-2026-61281 Overview
CVE-2026-61281 is a high-severity 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. Successful exploitation requires user interaction from a person other than the attacker. Successful attacks can result in unauthorized creation, deletion, or modification of critical data, and unauthorized access to all Calculation Manager accessible data.
Critical Impact
Unauthenticated network-based attackers can gain full read and write access to all Oracle Hyperion Calculation Manager data after tricking a legitimate user into interacting with a crafted request.
Affected Products
- Oracle Hyperion Calculation Manager
- Oracle Hyperion (Security component)
- Version 11.2.25.0.000
Discovery Timeline
- 2026-08-18 - CVE-2026-61281 published to NVD
- 2026-08-20 - Last updated in NVD database
- August 2026 - Oracle publishes Security Alert advisory cspuaug2026
Technical Details for CVE-2026-61281
Vulnerability Analysis
The vulnerability resides in the Security component of Oracle Hyperion Calculation Manager. An attacker exploits the flaw remotely over HTTP without authenticating to the application. Exploitation requires a legitimate user to interact with attacker-supplied content, indicating a user-assisted attack pattern consistent with cross-site request forgery or crafted-link exploitation. Once the interaction occurs, the attacker gains the ability to read, create, delete, or modify data accessible through Calculation Manager. Availability of the service is not impacted, but confidentiality and integrity of all reachable Calculation Manager data are compromised.
Root Cause
Oracle's advisory identifies the flaw within the Security component of Calculation Manager but does not disclose the underlying implementation defect. The combination of unauthenticated access with mandatory user interaction points to insufficient request validation or missing anti-forgery protections on state-changing endpoints. No CWE identifier has been assigned.
Attack Vector
The attack originates over the network via HTTP. An attacker crafts a malicious request or web resource and delivers it to an authenticated Hyperion user through phishing, malicious links, or hosted content. When the target interacts with the payload, the request is processed in the context that permits data access and modification within Calculation Manager. No credentials, tokens, or privileges are required from the attacker.
See the Oracle Security Alert August 2026 for authoritative technical details. No public proof-of-concept code is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The current EPSS probability is 0.268%.
Detection Methods for CVE-2026-61281
Indicators of Compromise
- Unexpected HTTP requests to Oracle Hyperion Calculation Manager endpoints originating from browser referrers outside the organization.
- Unauthorized creation, modification, or deletion events in Calculation Manager audit logs tied to legitimate user sessions.
- Anomalous session activity from Hyperion users shortly after clicking external links or opening email attachments.
Detection Strategies
- Enable and centralize Oracle Hyperion application and web server logs to identify state-changing operations initiated through cross-origin requests.
- Correlate email gateway telemetry and web proxy logs with Hyperion session activity to detect phishing-driven exploitation attempts.
- Deploy web application firewall rules that flag Calculation Manager POST requests missing expected referrer or origin headers.
Monitoring Recommendations
- Alert on bulk data read, export, or modification events performed by individual user accounts within short time windows.
- Monitor authentication and session activity for Hyperion administrators and finance users with elevated Calculation Manager access.
- Ingest Oracle Hyperion logs into a centralized analytics platform for baseline deviation analysis and long-term retention.
How to Mitigate CVE-2026-61281
Immediate Actions Required
- Apply the security fix referenced in the Oracle Security Alert August 2026 advisory for Oracle Hyperion Calculation Manager 11.2.25.0.000.
- Restrict network exposure of Oracle Hyperion Calculation Manager to trusted internal networks and VPN-only access.
- Notify Hyperion users of the user-interaction requirement and reinforce phishing awareness targeting finance and planning teams.
Patch Information
Oracle addressed CVE-2026-61281 in the August 2026 Security Alert. Administrators should reference the Oracle Security Alert August 2026 bulletin for the exact patch identifiers, prerequisites, and installation instructions applicable to Oracle Hyperion Calculation Manager version 11.2.25.0.000.
Workarounds
- Place Oracle Hyperion Calculation Manager behind a reverse proxy that enforces strict Origin and Referer header validation.
- Require re-authentication or step-up authentication for state-changing operations in Calculation Manager until patching is complete.
- Segment Hyperion infrastructure so that only authorized workstations can reach the application over HTTP.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
