CVE-2026-62566: Oracle Hyperion Information Disclosure Flaw

CVE-2026-62566 Overview

CVE-2026-62566 is an information disclosure vulnerability in the Oracle Hyperion Infrastructure Technology product, within the Installation and Configuration component. The affected supported version is 11.2.25.0.000. An unauthenticated attacker with network access via HTTP can exploit this flaw to gain unauthorized read access to a subset of Oracle Hyperion Infrastructure Technology data. The attack requires no user interaction and no privileges, making exploitation straightforward against exposed instances. Oracle disclosed the issue in its August 2026 Critical Patch Update.

Critical Impact
Unauthenticated remote attackers can read a subset of Oracle Hyperion Infrastructure Technology data over HTTP without user interaction.

Affected Products

Oracle Hyperion Infrastructure Technology 11.2.25.0.000
Component: Installation and Configuration
Deployments exposing Hyperion HTTP endpoints to untrusted networks

Discovery Timeline

2026-08-18 - CVE-2026-62566 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-62566

Vulnerability Analysis

The vulnerability resides in the Installation and Configuration component of Oracle Hyperion Infrastructure Technology. An attacker sends crafted HTTP requests to an exposed Hyperion service and receives access to data that should require authentication. The impact is limited to confidentiality; integrity and availability are not affected. Oracle categorizes the flaw as easily exploitable, meaning no chained conditions or specialized tooling are required.

Because the attack vector is network-based and unauthenticated, any Hyperion instance reachable from an untrusted network is exposed. The disclosed data represents a subset of Hyperion Infrastructure Technology accessible information, which may include configuration metadata useful for follow-on attacks.

Root Cause

Oracle has not published root cause details in the public advisory. The Installation and Configuration component appears to expose data through an HTTP interface without enforcing authentication or access control on the affected endpoint. Full technical specifics are restricted to Oracle's licensed advisory content.

Attack Vector

Exploitation requires only network reachability to the Hyperion HTTP interface. The attacker issues HTTP requests targeting the vulnerable Installation and Configuration endpoint and parses the response for exposed data. No credentials, tokens, or user interaction are required. See the Oracle Security Alert for vendor-specific details.

// No verified proof-of-concept code is publicly available for CVE-2026-62566.
// Refer to the Oracle Security Alert (cspuaug2026) for authoritative technical details.

Detection Methods for CVE-2026-62566

Indicators of Compromise

Unauthenticated HTTP GET or POST requests to Hyperion Installation and Configuration endpoints from external or unexpected source IPs
Anomalous outbound data volumes from Hyperion servers to untrusted networks
Access log entries lacking associated authenticated session identifiers

Detection Strategies

Baseline HTTP access patterns to Hyperion services and alert on unauthenticated requests reaching configuration endpoints
Correlate web server logs with authentication logs to identify requests that returned data without a valid session
Deploy web application firewall (WAF) rules that inspect requests targeting Hyperion Infrastructure Technology URIs

Monitoring Recommendations

Forward Hyperion HTTP server and application logs to a centralized SIEM for retention and correlation
Monitor for scanning behavior from external IPs probing known Hyperion URI patterns
Track configuration file and metadata reads that occur outside change-management windows

How to Mitigate CVE-2026-62566

Immediate Actions Required

Apply the Oracle Critical Patch Update referenced in the August 2026 security alert to all instances of Oracle Hyperion Infrastructure Technology 11.2.25.0.000
Restrict network access to Hyperion HTTP interfaces so only trusted management networks can reach them
Review HTTP access logs for indicators of unauthenticated reads against Installation and Configuration endpoints

Patch Information

Oracle addressed CVE-2026-62566 in the August 2026 Critical Patch Update. Refer to the Oracle Security Alert for the specific patch bundle, prerequisites, and installation instructions applicable to Oracle Hyperion Infrastructure Technology 11.2.25.0.000.

Workarounds

Place Hyperion services behind an authenticating reverse proxy that blocks anonymous access to configuration URIs
Apply network segmentation and firewall rules that limit HTTP access to Hyperion administrators only
Disable or restrict any Installation and Configuration endpoints that are not required for production operation

bash

# Example: restrict inbound HTTP access to Hyperion to a trusted management CIDR
# (adjust interface, port, and CIDR to your environment)
iptables -A INPUT -p tcp --dport 19000 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 19000 -j DROP