CVE-2026-87191: Oracle Hyperion Financial Management Auth Bypass

CVE-2026-87191 Overview

CVE-2026-87191 is a vulnerability in the Security component of Oracle Hyperion Financial Management. The flaw affects version 11.2.26.0.000 and permits a low-privileged attacker with network access via HTTP to compromise the application. Successful exploitation can grant unauthorized access to all data accessible by Oracle Hyperion Financial Management and cause a partial denial of service.

Critical Impact
An authenticated attacker over the network can extract sensitive financial data and degrade application availability without user interaction.

Affected Products

Oracle Hyperion Financial Management 11.2.26.0.000
Oracle Hyperion (Security component)
Deployments exposing Hyperion Financial Management over HTTP

Discovery Timeline

2026-09-15 - CVE-2026-87191 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-87191

Vulnerability Analysis

The vulnerability resides in the Security component of Oracle Hyperion Financial Management. An attacker with valid low-privilege credentials can send crafted HTTP requests to the application and escalate access to data outside their authorization scope. The impact profile emphasizes confidentiality, with high exposure of application-accessible data and partial availability degradation. Integrity is not affected, which suggests the flaw involves broken access control or improper authorization checks rather than data modification primitives.

Because Hyperion Financial Management processes consolidated financial data, exposure of accessible records can include ledgers, subsidiary consolidations, and reporting hierarchies. The Exploit Prediction Scoring System (EPSS) currently reports a low probability of near-term exploitation, but the low attack complexity and network reachability make this vulnerability attractive for post-authentication lateral movement.

Root Cause

Oracle's advisory does not disclose the underlying defect. The CVSS profile with high confidentiality impact, no integrity impact, and low availability impact is consistent with an authorization bypass or information disclosure weakness in the Security component. No Common Weakness Enumeration (CWE) identifier has been assigned in the NVD entry.

Attack Vector

Exploitation requires network access to the Hyperion Financial Management HTTP interface and valid credentials at any privilege tier. No user interaction is required, and the attack executes within the vulnerable component's security scope. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-published details.

No public proof-of-concept exploit code has been observed. Oracle has not released technical exploitation details.

Detection Methods for CVE-2026-87191

Indicators of Compromise

Unusual HTTP requests to Hyperion Financial Management endpoints from low-privilege service accounts
Authenticated sessions accessing consolidation data, entities, or scenarios outside the user's role assignments
Spikes in HFM application server errors or partial service unavailability without corresponding load

Detection Strategies

Audit Hyperion application and web-tier logs for access patterns that deviate from documented user role scopes
Correlate authentication events with subsequent data-access operations to surface privilege boundary violations
Deploy web application firewall rules that inspect HTTP traffic to the Hyperion Security component for anomalous parameter values

Monitoring Recommendations

Forward Hyperion Financial Management logs and web server access logs to a centralized SIEM for continuous review
Baseline normal query volumes per user role and alert on statistical deviations
Monitor for repeated 4xx or 5xx responses from the Security component that may indicate probing activity

How to Mitigate CVE-2026-87191

Immediate Actions Required

Apply the Oracle Critical Patch Update associated with Security Alert CSPUSEP2026 as soon as it is validated in a non-production environment
Inventory all Hyperion Financial Management deployments and confirm the running version against 11.2.26.0.000
Restrict network access to Hyperion HTTP endpoints so only authorized administrative and business users can reach the interface
Review and reduce standing privileges on Hyperion accounts, removing dormant or over-provisioned users

Patch Information

Oracle addressed this vulnerability in the security release referenced by Oracle Security Alert CSPUSEP2026. Administrators should follow Oracle's Critical Patch Update advisory guidance and apply the fix during the next available maintenance window.

Workarounds

Place Hyperion Financial Management behind a reverse proxy or VPN to eliminate direct network exposure
Enforce network segmentation so only finance and administrative subnets can reach the HTTP interface
Rotate credentials for accounts with access to the Security component and enforce multi-factor authentication at the identity provider

bash

# Example network restriction using firewall rules
# Allow only finance subnet to reach Hyperion HTTP port
iptables -A INPUT -p tcp --dport 443 -s 10.20.30.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP