CVE-2026-70676: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-70676 Overview

CVE-2026-70676 is a high-severity vulnerability in the Oracle Hyperion Calculation Manager product of Oracle Hyperion. The flaw resides in the Security component and affects supported version 11.2.25.0.000. An unauthenticated attacker with network access via HTTP can exploit the vulnerability, though successful attacks require overcoming high attack complexity. Exploitation allows unauthorized creation, deletion, or modification of critical data accessible to Oracle Hyperion Calculation Manager. Attackers can also obtain unauthorized read access to a subset of data and cause a partial denial of service. The weakness is classified under CWE-284: Improper Access Control.

Critical Impact
Unauthenticated network attackers can modify or delete critical Oracle Hyperion Calculation Manager data and trigger partial denial-of-service conditions against enterprise financial planning workloads.

Affected Products

Oracle Hyperion Calculation Manager 11.2.25.0.000
Oracle Hyperion product family (Security component)
Deployments exposing Hyperion Calculation Manager over HTTP

Discovery Timeline

2026-08-18 - CVE-2026-70676 published to NVD
2026-08-20 - Last updated in NVD database
August 2026 - Oracle publishes advisory in the Oracle Critical Patch Update / Security Alert (August 2026)

Technical Details for CVE-2026-70676

Vulnerability Analysis

The vulnerability originates in the Security component of Oracle Hyperion Calculation Manager. Improper access control allows a remote attacker without valid credentials to interact with restricted functionality over HTTP. The scope is unchanged, meaning exploitation stays within the vulnerable component, but the integrity impact is high. Attackers can create, alter, or destroy business-critical financial modeling data managed by Calculation Manager.

Successful exploitation also produces limited confidentiality loss through unauthorized read access to a subset of application data. Availability degrades in a limited fashion, resulting in partial denial of service rather than full outage. The high attack complexity indicates that exploitation depends on specific conditions outside the attacker's control, such as timing or configuration state.

Root Cause

The root cause maps to CWE-284: Improper Access Control. The Security component fails to enforce authorization checks on certain HTTP-accessible functions. Because no privileges or user interaction are required, the check gap is reachable directly from the network by anonymous clients.

Attack Vector

The attack vector is network-based (HTTP). An attacker sends crafted HTTP requests to an exposed Oracle Hyperion Calculation Manager endpoint. If preconditions align, the server processes the requests without proper authorization enforcement. The attacker then reads, alters, or removes data records and can degrade a subset of service functionality. Oracle has not published technical exploitation details; refer to the Oracle Security Alert for vendor-provided guidance.

Detection Methods for CVE-2026-70676

Indicators of Compromise

Unauthenticated HTTP requests to Oracle Hyperion Calculation Manager endpoints originating from unexpected source ranges
Unexpected create, update, or delete operations against Calculation Manager business rules, allocations, or metadata
Application error spikes or transient service unavailability affecting Calculation Manager users
Access log entries containing anomalous URI patterns targeting Security component functions

Detection Strategies

Correlate web server access logs with Calculation Manager audit logs to identify data modifications lacking a corresponding authenticated session
Baseline normal API call patterns for Hyperion Calculation Manager and alert on deviations from that baseline
Monitor for HTTP requests to Calculation Manager endpoints from clients that never completed authentication

Monitoring Recommendations

Enable verbose audit logging on Oracle Hyperion Calculation Manager and forward logs to a centralized SIEM
Track integrity of business rules, calculation scripts, and allocation definitions using file and object change monitoring
Alert on abnormal HTTP status distributions from Calculation Manager endpoints, especially bursts of 4xx or 5xx responses

How to Mitigate CVE-2026-70676

Immediate Actions Required

Apply the August 2026 Oracle Critical Patch Update / Security Alert fixes for Oracle Hyperion Calculation Manager as documented in the Oracle advisory
Inventory all Oracle Hyperion Calculation Manager 11.2.25.0.000 deployments and prioritize internet-exposed instances
Restrict network access to Calculation Manager HTTP endpoints to trusted management and user networks only
Review Calculation Manager audit logs for the last several months to identify unauthorized modifications

Patch Information

Oracle addresses CVE-2026-70676 in the August 2026 Critical Patch Update / Security Alert cycle. Administrators should review the Oracle Security Alert – August 2026 for the specific patch bundles applicable to their Hyperion deployment. Apply the patches in a test environment first, then promote to production following Oracle's documented upgrade procedures.

Workarounds

Place Oracle Hyperion Calculation Manager behind a reverse proxy or web application firewall that enforces authentication before requests reach the application
Block direct external HTTP access to Calculation Manager and require VPN or zero-trust network access for authorized users
Segment Hyperion infrastructure so that only application tiers requiring Calculation Manager access can reach its HTTP interface
Increase audit logging retention until patches are validated in production