CVE-2026-87198: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-87198 Overview

CVE-2026-87198 is a vulnerability in the Security component of Oracle Hyperion Financial Management, part of the Oracle Hyperion product family. The affected version is 11.2.26.0.000. An unauthenticated attacker with network access over HTTP can compromise the application, though successful exploitation is difficult and requires specific conditions.

Successful attacks can result in unauthorized creation, modification, or deletion of all data accessible to Oracle Hyperion Financial Management. Attackers can also gain complete read access to that data, exposing sensitive financial records.

Critical Impact
Unauthenticated network attackers can gain full read and write access to financial data managed by Oracle Hyperion Financial Management.

Affected Products

Oracle Hyperion Financial Management 11.2.26.0.000
Component: Security
Product family: Oracle Hyperion

Discovery Timeline

2026-09-15 - CVE-2026-87198 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-87198

Vulnerability Analysis

The vulnerability resides in the Security component of Oracle Hyperion Financial Management. It is reachable over the network through HTTP without authentication, but the attack complexity is high, meaning the attacker must satisfy conditions outside their direct control to succeed.

When exploited, the flaw breaks the confidentiality and integrity boundaries of the application. Attackers gain the ability to read all Hyperion Financial Management data and to create, modify, or delete records. Availability of the service is not affected.

Oracle Hyperion Financial Management stores consolidated financial results, journal entries, and reporting metadata. Unauthorized modification of these records can distort financial reporting and compromise audit integrity.

Root Cause

Oracle has not published detailed root cause information in the advisory. The issue is scoped to the Security component, which handles authentication, authorization, and access enforcement for the application. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-provided technical context.

Attack Vector

The attack vector is network-based over HTTP. No user interaction and no prior authentication are required. The attacker sends crafted requests to an exposed Hyperion Financial Management instance. Because attack complexity is high, exploitation depends on environmental factors such as timing, configuration, or state.

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 0.257%.

Detection Methods for CVE-2026-87198

Indicators of Compromise

Unexpected creation, modification, or deletion of records within Hyperion Financial Management applications.
Anonymous or unauthenticated HTTP requests to Hyperion Financial Management endpoints from external or unusual internal sources.
Access to sensitive financial data outside of scheduled reporting cycles or approved workflows.

Detection Strategies

Enable and review Hyperion Financial Management audit logs for administrative and data-modification events without a corresponding authenticated user session.
Deploy web application firewall rules to identify anomalous HTTP request patterns targeting Hyperion endpoints.
Correlate application, IIS, and network telemetry to identify unauthenticated request sequences that precede data changes.

Monitoring Recommendations

Forward Hyperion Financial Management logs to a centralized SIEM for correlation with identity and network events.
Alert on off-hours modifications to consolidation rules, journals, or metadata.
Monitor egress traffic from Hyperion servers for unexpected large data transfers that may indicate mass exfiltration.

How to Mitigate CVE-2026-87198

Immediate Actions Required

Apply the fixes referenced in the Oracle Security Alert CSPUSEP2026 as soon as the patch cycle permits.
Inventory all Oracle Hyperion Financial Management instances and confirm which are running version 11.2.26.0.000.
Restrict network exposure of Hyperion Financial Management HTTP endpoints to trusted management networks only.
Review Hyperion audit logs for signs of unauthorized data access or modification prior to patching.

Patch Information

Oracle addressed this vulnerability through the Oracle Security Alert CSPUSEP2026. Administrators should consult the Oracle Security Alert CSPUSEP2026 for the specific patch identifiers, prerequisites, and installation guidance applicable to affected deployments.

Workarounds

Place Hyperion Financial Management behind a reverse proxy or web application firewall that enforces strict allowlisting of source IPs.
Require VPN or zero-trust network access for all administrative and end-user connections to Hyperion.
Disable or restrict any externally reachable Hyperion HTTP interfaces that are not required for business operations.

bash

# Example: restrict Hyperion HTTP access at the network edge
# Replace 10.0.0.0/24 with your trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP