CVE-2026-70679: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-70679 Overview

CVE-2026-70679 is a network-exploitable vulnerability in the Security component of Oracle Hyperion Calculation Manager, part of the Oracle Hyperion product family. The affected version is 11.2.25.0.000. An unauthenticated attacker with HTTP access to the application can compromise integrity by performing unauthorized update, insert, or delete operations against a subset of accessible data. The flaw does not require user interaction and can be exercised across the network without prior credentials. Oracle disclosed the issue in the August 2026 Critical Patch Update Security Alert.

Critical Impact
Unauthenticated network attackers can modify or delete data accessible to Oracle Hyperion Calculation Manager without authorization.

Affected Products

Oracle Hyperion Calculation Manager 11.2.25.0.000
Oracle Hyperion (parent product line)
Security component of Oracle Hyperion Calculation Manager

Discovery Timeline

2026-08-18 - CVE-2026-70679 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-70679

Vulnerability Analysis

The vulnerability resides in the Security component of Oracle Hyperion Calculation Manager. According to Oracle, the flaw is easily exploitable and reachable over HTTP by an unauthenticated attacker. Successful exploitation leads to unauthorized write operations against data accessible to the Calculation Manager application. Confidentiality and availability are not affected; the impact is limited to integrity.

Oracle Hyperion Calculation Manager is used to design, validate, and administer business rules for Hyperion Planning and Financial Management. An integrity compromise in this component can lead to tampered calculation logic, altered rule definitions, or manipulation of financial data referenced by downstream reporting.

Root Cause

Oracle has not published the underlying weakness class, and no CWE identifier is associated with CVE-2026-70679 at this time. Based on the advisory language, the flaw is in the Security subsystem and permits state-changing operations without proper authentication or authorization enforcement. Review the Oracle Security Alert for authoritative details.

Attack Vector

The attack is remote and network-based, delivered over HTTP against an exposed Calculation Manager instance. No credentials or user interaction are required. An attacker who can reach the application endpoint can invoke the affected functionality to modify, insert, or delete records within Calculation Manager's accessible data scope.

No verified proof-of-concept code is available. The vulnerability mechanism is described in prose because no vendor-published or public exploit code has been released. Refer to the Oracle Security Alert for technical details.

Detection Methods for CVE-2026-70679

Indicators of Compromise

Unexpected update, insert, or delete operations against Hyperion Calculation Manager business rule tables or metadata.
HTTP requests from unauthenticated or anonymous sessions reaching Calculation Manager endpoints that trigger state changes.
Modifications to calculation rules, rule sets, or security assignments without a corresponding administrator audit trail.

Detection Strategies

Enable and review Hyperion Calculation Manager audit logs for changes to rules, rule sets, and security artifacts, correlated with the initiating user context.
Inspect web server and reverse proxy logs for HTTP requests to Calculation Manager URIs originating from unauthenticated sessions.
Baseline expected administrative activity and alert on out-of-hours or high-volume write operations against Calculation Manager objects.

Monitoring Recommendations

Forward Hyperion application, WebLogic, and HTTP access logs into a centralized logging or SIEM platform for retention and correlation.
Monitor database-level write activity against Calculation Manager schemas for changes not tied to authenticated administrator sessions.
Alert on network flows to Calculation Manager listeners from sources outside the expected administrative subnet.

How to Mitigate CVE-2026-70679

Immediate Actions Required

Apply the fixes provided in the Oracle August 2026 Critical Patch Update Security Alert as soon as change management permits.
Restrict network access to Oracle Hyperion Calculation Manager to trusted administrative networks using firewall or reverse proxy allow-lists.
Audit recent changes to Calculation Manager rules, rule sets, and security assignments for unauthorized modifications.

Patch Information

Oracle addressed CVE-2026-70679 in the August 2026 Critical Patch Update Security Alert. Administrators should consult the Oracle Security Alert for the applicable patch bundle covering Oracle Hyperion Calculation Manager 11.2.25.0.000 and follow Oracle's documented patching procedure for Hyperion environments.

Workarounds

Place Calculation Manager behind an authenticating reverse proxy that blocks anonymous HTTP requests to sensitive endpoints.
Enforce network segmentation so only Hyperion administrators and Planning/Financial Management application servers can reach Calculation Manager.
Increase audit log retention and enable database-level change auditing on Calculation Manager schemas until the patch is deployed.

bash

# Example: restrict Calculation Manager access at the reverse proxy (illustrative)
# Replace <admin_subnet> and <cm_backend> with environment-specific values
location /calcmgr/ {
    allow <admin_subnet>;
    deny  all;
    proxy_pass http://<cm_backend>;
}