CVE-2026-87204: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-87204 Overview

CVE-2026-87204 is a privilege escalation vulnerability in the Security component of Oracle Hyperion Financial Management. The affected version is 11.2.26.0.000. An authenticated attacker with low privileges can exploit the flaw over the network via HTTP to fully compromise the application.

Successful exploitation results in complete takeover of Oracle Hyperion Financial Management, with high impact to confidentiality, integrity, and availability. The vulnerability is classified under CWE-269: Improper Privilege Management.

Critical Impact
A low-privileged attacker with network access can escalate privileges to take over Oracle Hyperion Financial Management, exposing financial consolidation and reporting data.

Affected Products

Oracle Hyperion Financial Management version 11.2.26.0.000
Security component of Oracle Hyperion
Deployments accessible over HTTP

Discovery Timeline

2026-09-15 - CVE-2026-87204 published to the National Vulnerability Database
2026-09-17 - Last updated in NVD database
Oracle Security Alert CSPUSEP2026 - Vendor advisory published by Oracle

Technical Details for CVE-2026-87204

Vulnerability Analysis

The vulnerability resides in the Security component of Oracle Hyperion Financial Management. Oracle classifies it as easily exploitable and reachable over HTTP with only low privileges required. Successful exploitation grants the attacker control of the target application, including its data and configuration.

As a financial consolidation platform, Hyperion Financial Management processes sensitive accounting, forecasting, and reporting data. Takeover of the application places general ledger data, intercompany eliminations, and audit trails at risk of unauthorized access, modification, or destruction.

Oracle's advisory does not disclose the exact defect but attributes the issue to CWE-269: Improper Privilege Management. The EPSS probability is 0.447%, indicating a low near-term likelihood of observed exploitation at publication time.

Root Cause

The root cause is improper privilege management within the Security component. Authorization decisions or role assignments do not adequately constrain what a low-privileged, authenticated user can do. This allows the attacker to perform actions reserved for higher-privileged roles.

Attack Vector

The attacker must hold valid low-privileged credentials for the target Hyperion Financial Management instance. The attacker sends crafted HTTP requests to the application and abuses the flaw in the Security component to elevate privileges or perform privileged operations. No user interaction is required, and the attack completes within a single trust boundary.

Oracle has not released public exploitation code. Refer to the Oracle Security Alert CSPUSEP2026 for vendor guidance.

Detection Methods for CVE-2026-87204

Indicators of Compromise

Unexpected changes to user roles, group memberships, or security classes within Hyperion Financial Management
HTTP requests from low-privileged accounts targeting administrative endpoints of the Security component
New administrative or application-level accounts created outside of standard change windows
Anomalous access to consolidation rules, metadata, or journal entries by non-administrative users

Detection Strategies

Review Hyperion audit logs for privilege changes, role assignments, and administrative actions correlated with low-privileged sessions
Baseline normal HTTP request patterns to the Hyperion web tier and alert on deviations from expected user behavior
Correlate authentication events with subsequent privileged operations to identify improbable escalations

Monitoring Recommendations

Forward Hyperion Financial Management application, web server, and database audit logs to a centralized SIEM for retention and analysis
Enable verbose security auditing within Hyperion to capture role and permission changes
Monitor outbound network activity from the Hyperion application server for signs of post-exploitation data staging

How to Mitigate CVE-2026-87204

Immediate Actions Required

Apply the patches published in Oracle Security Alert CSPUSEP2026 to affected Hyperion Financial Management deployments
Inventory all instances of Oracle Hyperion Financial Management 11.2.26.0.000 and prioritize internet-adjacent systems
Rotate credentials for accounts that have accessed the affected system since the last known-good state
Audit existing user roles and remove standing privileges that are not required for business operations

Patch Information

Oracle addresses this vulnerability in the security alert referenced above. Administrators should review the alert's patch availability document, download the fix for Oracle Hyperion Financial Management 11.2.26.0.000, and follow Oracle's documented patching procedure in a non-production environment before rolling out to production.

Workarounds

Restrict network access to the Hyperion web tier using firewall rules, VPN, or reverse proxy allowlists until patches are applied
Enforce least privilege on all Hyperion accounts and disable dormant users
Require multi-factor authentication at the identity provider for all Hyperion users to raise the cost of low-privileged account compromise

bash

# Example: restrict HTTP access to the Hyperion web tier to trusted subnets
# Replace interface and CIDR values with your environment's specifics
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP