CVE-2026-61306: Oracle E-Business Suite Auth Bypass Flaw

CVE-2026-61306 Overview

CVE-2026-61306 affects the Oracle Complex Maintenance, Repair and Overhaul product within Oracle E-Business Suite, specifically the Production component. Supported versions 12.2.3 through 12.2.15 are affected. A low-privileged attacker with network access via HTTP can exploit the flaw, though the attack complexity is high. Successful exploitation causes a scope change and can lead to unauthorized access to critical data across the application, along with a partial denial of service. The vulnerability is categorized under [CWE-284: Improper Access Control].

Critical Impact
Authenticated network attackers can gain complete access to Oracle Complex Maintenance, Repair and Overhaul data and cause partial denial of service, with impact extending beyond the vulnerable component.

Affected Products

Oracle E-Business Suite - Oracle Complex Maintenance, Repair and Overhaul 12.2.3
Oracle E-Business Suite - Oracle Complex Maintenance, Repair and Overhaul versions 12.2.4 through 12.2.14
Oracle E-Business Suite - Oracle Complex Maintenance, Repair and Overhaul 12.2.15

Discovery Timeline

2026-08-18 - CVE-2026-61306 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-61306

Vulnerability Analysis

The vulnerability resides in the Production component of Oracle Complex Maintenance, Repair and Overhaul (CMRO), part of Oracle E-Business Suite. A low-privileged, authenticated attacker sending crafted HTTP requests can bypass intended access restrictions. The flaw is classified as [CWE-284: Improper Access Control], indicating that the application fails to correctly enforce authorization checks on protected resources or actions.

Successful exploitation grants complete access to all data accessible through CMRO. The scope change described by Oracle means the impact extends beyond CMRO into additional Oracle E-Business Suite modules that share trust boundaries with the vulnerable component. Attackers can also trigger a partial denial of service against CMRO functionality.

Root Cause

The root cause is improper access control within the CMRO Production component. The application does not sufficiently validate that a caller possesses authorization for the requested resource or operation, allowing a low-privileged user to reach functionality or data intended for higher-privileged principals.

Attack Vector

Exploitation requires network access over HTTP and a valid low-privileged account within the Oracle E-Business Suite deployment. No user interaction is required. Attack complexity is high, meaning the attacker must satisfy conditions outside their direct control, such as specific application state or configuration. No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Specific exploitation details have not been publicly released by Oracle. Refer to the Oracle Security Alert for authoritative advisory information.

Detection Methods for CVE-2026-61306

Indicators of Compromise

Anomalous HTTP requests to Oracle E-Business Suite CMRO endpoints originating from low-privileged user sessions.
Access to CMRO Production data or functions inconsistent with the authenticated user's assigned role.
Unexpected errors or partial service degradation within CMRO modules coinciding with elevated request volume.

Detection Strategies

Enable Oracle E-Business Suite auditing on CMRO Production tables and APIs to record read and modify operations by principal.
Correlate web-tier access logs with application-tier authorization decisions to identify requests that bypass expected role checks.
Baseline typical CMRO user behavior and alert on deviations such as broad data enumeration by low-privileged accounts.

Monitoring Recommendations

Forward Oracle E-Business Suite application, database audit, and HTTP server logs to a centralized analytics platform for correlation.
Monitor for cross-module access patterns that reflect the documented scope change from CMRO into adjacent E-Business Suite products.
Alert on repeated authorization failures followed by successful sensitive operations from the same session.

How to Mitigate CVE-2026-61306

Immediate Actions Required

Apply the Oracle Critical Patch Update referenced in the Oracle Security Alert to all Oracle E-Business Suite 12.2.3 through 12.2.15 environments.
Inventory all CMRO deployments and confirm patch coverage, prioritizing internet-exposed instances.
Review and tighten role assignments in Oracle E-Business Suite, removing unnecessary CMRO privileges from low-privileged accounts.

Patch Information

Oracle addresses this vulnerability in its August 2026 Security Alert cycle for Oracle E-Business Suite. Administrators should apply the patch bundle covering CMRO versions 12.2.3 through 12.2.15 as documented in the Oracle Security Alert.

Workarounds

Restrict network access to Oracle E-Business Suite CMRO endpoints using web application firewall rules and network segmentation.
Require multi-factor authentication for all Oracle E-Business Suite users to raise the cost of credential compromise.
Disable or restrict CMRO Production functionality for user populations that do not require it until the patch is applied.

bash

# Configuration example
# Restrict access to Oracle E-Business Suite CMRO URLs at the reverse proxy
# Example nginx rule limiting CMRO paths to trusted internal networks
location ~* /OA_HTML/.*(CMRO|Maintenance) {
    allow 10.0.0.0/8;
    deny  all;
    proxy_pass http://ebs-backend;
}