CVE-2026-83455: Oracle Demand Signal Repository Auth Bypass

CVE-2026-83455 Overview

CVE-2026-83455 is a high-severity vulnerability in the Oracle Demand Signal Repository product of Oracle E-Business Suite, within the Internal Operations component. Affected versions span 12.2.3 through 12.2.15. A low-privileged attacker with network access via HTTP can exploit this flaw to compromise the application. Successful exploitation allows unauthorized creation, deletion, or modification of critical data, along with unauthorized read access to all Oracle Demand Signal Repository accessible data. Oracle addressed the issue in Security Alert CSPUSEP2026.

Critical Impact
Authenticated attackers with minimal privileges can read, modify, or delete all data accessible to Oracle Demand Signal Repository over the network.

Affected Products

Oracle E-Business Suite - Oracle Demand Signal Repository version 12.2.3
Oracle E-Business Suite - Oracle Demand Signal Repository versions 12.2.4 through 12.2.14
Oracle E-Business Suite - Oracle Demand Signal Repository version 12.2.15

Discovery Timeline

2026-09-15 - CVE-2026-83455 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-83455

Vulnerability Analysis

The vulnerability resides in the Internal Operations component of Oracle Demand Signal Repository, an Oracle E-Business Suite module used to aggregate and analyze downstream demand data. Oracle's advisory categorizes the flaw as easily exploitable and reachable over HTTP by any authenticated user holding low privileges. Once exploited, the attacker gains high-impact access to confidentiality and integrity, but availability remains unaffected. This suggests a data-layer weakness such as broken access control or injection into a backend query path rather than a service-disrupting flaw. The scope remains unchanged, indicating the impact is contained to resources managed by the vulnerable component. Because Oracle Demand Signal Repository stores forecasting, inventory, and supply chain intelligence, unauthorized modification can influence downstream business decisions.

Root Cause

Oracle has not published root-cause details in the public advisory. The CVSS profile — network-reachable, low complexity, low privileges required, no user interaction, and high confidentiality and integrity impact — is consistent with missing authorization checks or improper input handling in an HTTP-accessible endpoint of the Internal Operations component.

Attack Vector

An attacker requires network reachability to the Oracle E-Business Suite HTTP interface and any valid low-privileged account on the affected instance. No user interaction is needed. The attacker issues crafted HTTP requests to endpoints exposed by the Internal Operations component of Oracle Demand Signal Repository, resulting in unauthorized read and write access to data governed by that module. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-provided technical context.

Detection Methods for CVE-2026-83455

Indicators of Compromise

Unexpected HTTP requests to Oracle Demand Signal Repository Internal Operations endpoints originating from low-privileged application accounts.
Unauthorized inserts, updates, or deletes in Demand Signal Repository schemas without corresponding change tickets.
Anomalous session activity from application user accounts accessing data outside their functional role.

Detection Strategies

Enable Oracle E-Business Suite auditing on Demand Signal Repository tables and correlate database DML events with application session identifiers.
Inspect the Oracle HTTP Server access logs for unusual URI patterns targeting Internal Operations servlets and JSPs.
Compare account privilege level against the sensitivity of data being read or modified to surface authorization anomalies.

Monitoring Recommendations

Forward Oracle E-Business Suite application, database, and web tier logs to a centralized analytics platform for correlation and retention.
Alert on spikes in HTTP 200 responses to Demand Signal Repository endpoints from accounts that historically do not use the module.
Baseline normal Demand Signal Repository transaction volumes and flag deviations that align with off-hours or geographic anomalies.

How to Mitigate CVE-2026-83455

Immediate Actions Required

Apply the Oracle patch referenced in Security Alert CSPUSEP2026 to all Oracle E-Business Suite instances running Demand Signal Repository versions 12.2.3 through 12.2.15.
Inventory all Oracle E-Business Suite environments, including non-production, and confirm patch status for the Demand Signal Repository module.
Restrict HTTP access to Oracle E-Business Suite to trusted network segments and VPN users until patching completes.
Review recently created, modified, or deleted records within Demand Signal Repository for signs of unauthorized changes.

Patch Information

Oracle released a fix in Security Alert CSPUSEP2026. Administrators should download and apply the patch as directed in the Oracle Security Alert CSPUSEP2026. Follow standard Oracle E-Business Suite patching procedures, including AutoConfig and post-patch validation, and test in a non-production environment before deploying to production.

Workarounds

Disable or restrict access to Oracle Demand Signal Repository Internal Operations functionality where operationally feasible until the patch is applied.
Enforce least-privilege on Oracle E-Business Suite application accounts and remove Demand Signal Repository responsibilities from users who do not require them.
Place a web application firewall or reverse proxy in front of Oracle E-Business Suite to filter unexpected request patterns to Demand Signal Repository endpoints.

bash

# Configuration example: restrict HTTP access at the network edge
# Replace with your Oracle EBS hostname and trusted CIDR ranges
iptables -A INPUT -p tcp --dport 8000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8000 -j DROP