CVE-2026-83435: Oracle Bills of Material Auth Bypass Flaw

CVE-2026-83435 Overview

CVE-2026-83435 is a high-severity vulnerability in the Oracle Bills of Material product, part of Oracle E-Business Suite. The flaw resides in the Internal Operations component and affects supported versions 12.2.13 through 12.2.15. A low-privileged attacker with network access via HTTP can exploit the vulnerability, though the attack complexity is high. Successful exploitation results in unauthorized creation, deletion, or modification of critical data, and unauthorized access to all Oracle Bills of Material accessible data. The vulnerability introduces a scope change, meaning exploitation may significantly impact additional products beyond Oracle Bills of Material itself.

Critical Impact
Successful exploitation grants attackers full read and write access to Oracle Bills of Material data and can cascade to affect additional Oracle E-Business Suite components.

Affected Products

Oracle E-Business Suite - Oracle Bills of Material 12.2.13
Oracle E-Business Suite - Oracle Bills of Material 12.2.14
Oracle E-Business Suite - Oracle Bills of Material 12.2.15

Discovery Timeline

2026-09-15 - CVE CVE-2026-83435 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-83435

Vulnerability Analysis

The vulnerability affects the Internal Operations component of Oracle Bills of Material within Oracle E-Business Suite. An authenticated attacker with low privileges can send crafted HTTP requests to compromise the module. The scope change indicator means the exploit crosses a trust boundary, allowing impact on components beyond the vulnerable module. Confidentiality and integrity of Oracle Bills of Material data are fully compromised on successful exploitation, while availability is not affected. Because Oracle Bills of Material integrates with manufacturing, inventory, and engineering modules, unauthorized data modification can propagate through dependent business processes.

Root Cause

Oracle has not published detailed root-cause information beyond the Oracle Security Alert: CSPU Sept 2026. The advisory characterizes the issue as difficult to exploit and requiring valid low-privilege authentication. The scope change classification indicates the vulnerable code path grants access to resources managed under a different security authority than the vulnerable component itself.

Attack Vector

Exploitation occurs over the network using HTTP. The attacker must hold valid credentials with low privileges on the Oracle E-Business Suite instance. No user interaction is required. High attack complexity indicates conditions outside the attacker's control must be satisfied, such as specific application states or timing conditions. Public proof-of-concept code is not available at time of publication.

No verified exploitation code is publicly available. Refer to the Oracle Security Alert: CSPU Sept 2026 for technical guidance from the vendor.

Detection Methods for CVE-2026-83435

Indicators of Compromise

Unexpected creation, modification, or deletion of Bills of Material records by low-privileged accounts.
Anomalous HTTP requests targeting the Internal Operations component from user sessions that do not typically access this module.
Application audit log entries showing successful transactions that cross module boundaries following authentication by low-privilege users.

Detection Strategies

Enable Oracle E-Business Suite auditing on Bills of Material tables and monitor for record changes originating from accounts without a business need.
Correlate web application server access logs with database audit trails to identify requests that trigger cross-module data access.
Baseline normal HTTP request patterns to the Internal Operations component and alert on deviations from expected user roles.

Monitoring Recommendations

Forward Oracle E-Business Suite application, middleware, and database logs to a centralized analytics platform for correlation and long-term retention.
Review Oracle Fusion Middleware and WebLogic access logs for suspicious POST or PUT requests to Bills of Material endpoints.
Monitor authentication events for low-privilege accounts exhibiting behavior inconsistent with assigned responsibilities.

How to Mitigate CVE-2026-83435

Immediate Actions Required

Apply the Oracle Critical Security Patch Update released in September 2026 to all affected Oracle E-Business Suite 12.2.13 through 12.2.15 instances.
Inventory all Oracle E-Business Suite deployments and confirm the patch level of the Bills of Material module.
Review and reduce the number of accounts holding access to the Bills of Material Internal Operations component.
Rotate credentials for accounts that access Oracle E-Business Suite web interfaces if compromise is suspected.

Patch Information

Oracle addressed CVE-2026-83435 in the September 2026 Critical Security Patch Update. Patch details and download instructions are available in the Oracle Security Alert: CSPU Sept 2026. Administrators should follow Oracle's documented patch application process for E-Business Suite 12.2, which includes running adop in patching mode.

Workarounds

Restrict network access to the Oracle E-Business Suite web tier using firewall rules or a reverse proxy that enforces IP allow-lists.
Enforce strong authentication and short session lifetimes for all Oracle E-Business Suite users.
Where operationally feasible, temporarily revoke Bills of Material responsibilities from users who do not require them until patching is complete.

bash

# Apply Oracle E-Business Suite 12.2 patch using adop in hotpatch or online mode
# Refer to Oracle's official documentation before executing in production
source $EBS_APPS_ENV
adop phase=apply patches=<CSPU_SEP_2026_PATCH_NUMBER> apply_mode=hotpatch
adop phase=cleanup