CVE-2026-70823: Oracle Hyperion Auth Bypass Vulnerability

CVE-2026-70823 Overview

CVE-2026-70823 affects Oracle Hyperion Financial Management version 11.2.25.0.000 in the Security component. An unauthenticated attacker with network access via HTTPS can compromise the application, though the attack complexity is high. Successful exploitation permits unauthorized creation, deletion, or modification of critical data, and unauthorized read access to all data accessible by Oracle Hyperion Financial Management.

Oracle disclosed the issue in the Oracle Security Alert - August 2026. The vulnerability affects confidentiality and integrity but not availability.

Critical Impact
Unauthenticated network attackers can read, modify, or delete data across Oracle Hyperion Financial Management, exposing financial consolidation and reporting records.

Affected Products

Oracle Hyperion Financial Management 11.2.25.0.000
Oracle Hyperion (Security component)
Deployments exposing Hyperion Financial Management over HTTPS

Discovery Timeline

2026-08-18 - CVE-2026-70823 published to NVD
2026-08-18 - Oracle publishes the August 2026 Security Alert
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-70823

Vulnerability Analysis

The flaw resides in the Security component of Oracle Hyperion Financial Management, an enterprise application used for financial consolidation, close, and reporting. Oracle's advisory classifies the issue as difficult to exploit yet reachable without authentication over the network. A successful attack yields both read and write access to data managed by the application.

Because Hyperion Financial Management stores ledger consolidations, intercompany balances, and reporting metadata, integrity loss can propagate into downstream financial disclosures. Confidentiality loss exposes non-public financial data that is often subject to regulatory controls.

Oracle has not published root-cause specifics for CVE-2026-70823. The advisory limits public detail to CVSS metrics and impact scope, which is standard for Oracle Critical Patch Update disclosures.

Root Cause

Oracle attributes the vulnerability to the Security component of Hyperion Financial Management. No CWE identifier has been assigned in the NVD record. The vendor advisory does not describe the underlying defect, function names, or code paths involved.

Attack Vector

The attack originates over the network and requires no privileges or user interaction. An adversary sends crafted requests to the Hyperion Financial Management HTTPS interface. The high attack complexity indicates that specific preconditions or non-trivial steps are needed to reach the vulnerable code path.

Refer to the Oracle Security Alert - August 2026 for the authoritative advisory. No public proof-of-concept, exploit code, or CISA KEV listing is available at the time of publication.

Detection Methods for CVE-2026-70823

Indicators of Compromise

Unexpected HTTPS requests to Hyperion Financial Management endpoints from unknown or external source addresses.
Anomalous create, modify, or delete operations against financial data objects outside scheduled close activities.
Application, audit, or authentication log entries showing security-component actions without an associated authenticated session.

Detection Strategies

Compare inbound request patterns to the Hyperion web tier against baseline traffic from known finance users and integration systems.
Alert on administrative or data-modification actions in Hyperion audit logs that lack a corresponding successful authentication event.
Correlate web server access logs with application-tier events to identify unauthenticated calls that reach protected functions.

Monitoring Recommendations

Forward Hyperion application logs, web server access logs, and database audit logs to a centralized SIEM or data lake for correlation.
Enable database-level auditing on Hyperion schemas to record row-level changes to consolidation and metadata tables.
Monitor egress from Hyperion servers for unexpected outbound connections that could indicate post-exploitation data exfiltration.

How to Mitigate CVE-2026-70823

Immediate Actions Required

Apply the fixes referenced in the Oracle Security Alert - August 2026 as soon as change windows permit.
Inventory all Hyperion Financial Management instances running 11.2.25.0.000 and confirm patch status for each.
Restrict network reachability of the Hyperion HTTPS interface to trusted management networks, VPNs, or jump hosts.

Patch Information

Oracle addressed CVE-2026-70823 in the August 2026 Security Alert cycle. Administrators should follow the version and patch guidance published in the Oracle Security Alert - August 2026 and validate the update in a non-production environment before rollout.

Workarounds

Place Hyperion Financial Management behind a reverse proxy or web application firewall that enforces authentication and IP allow-listing.
Disable or block external exposure of the Hyperion HTTPS endpoint until the vendor patch is applied.
Rotate and review privileged Hyperion credentials, and enable multi-factor authentication for administrative and finance user access paths.

bash

# Example: restrict Hyperion HTTPS access to a trusted management subnet using iptables
iptables -A INPUT -p tcp --dport 443 -s 10.20.30.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP