CVE-2026-83142: Oracle Proposals Authentication Bypass Flaw

CVE-2026-83142 Overview

CVE-2026-83142 is an access control vulnerability [CWE-284] in the Oracle Proposals product of Oracle E-Business Suite, specifically within the Internal Operations component. The flaw affects supported versions 12.2.3 through 12.2.15. A low-privileged attacker with network access via HTTP can exploit this vulnerability to gain unauthorized access to critical Oracle Proposals data. The vulnerability includes a scope change, meaning successful attacks can significantly impact additional products beyond Oracle Proposals itself.

Critical Impact
Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle Proposals accessible data, with scope-changing impact on adjacent products.

Affected Products

Oracle E-Business Suite — Oracle Proposals versions 12.2.3 through 12.2.15
Component: Internal Operations
Deployments exposing Oracle Proposals over HTTP to authenticated users

Discovery Timeline

2026-09-15 - CVE-2026-83142 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-83142

Vulnerability Analysis

The vulnerability resides in the Oracle Proposals product within the Internal Operations component of Oracle E-Business Suite. An attacker with low privileges and HTTP access to the application can bypass access control restrictions. The confidentiality impact is high while integrity and availability remain unaffected, indicating the flaw enables unauthorized data reads rather than modification or disruption.

The scope change designation is significant. Attacks that begin in Oracle Proposals can reach data belonging to other products in the E-Business Suite deployment, extending the blast radius beyond the vulnerable component. This makes the vulnerability relevant even for organizations that consider Oracle Proposals a low-value module.

Root Cause

The underlying weakness is classified as Improper Access Control [CWE-284]. The Oracle Proposals module fails to correctly enforce authorization checks when handling certain HTTP requests, allowing an authenticated low-privileged user to reach data that should require higher entitlements. Oracle has not published implementation-level details in the public advisory.

Attack Vector

Exploitation requires network access to the Oracle E-Business Suite application over HTTP and a valid low-privileged account. No user interaction is required, and attack complexity is low. An attacker crafts HTTP requests targeting Oracle Proposals endpoints in the Internal Operations component to enumerate or retrieve data outside their authorization boundary.

No public proof-of-concept exploit code is available at the time of publication. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-provided technical guidance.

Detection Methods for CVE-2026-83142

Indicators of Compromise

Unexpected HTTP requests from low-privileged user sessions to Oracle Proposals endpoints under the Internal Operations component
Access log entries showing a single account retrieving data volumes inconsistent with normal role behavior
Cross-module data access patterns originating from Oracle Proposals sessions, consistent with the scope-change behavior

Detection Strategies

Review Oracle E-Business Suite application audit logs for authorization anomalies against Oracle Proposals URLs
Correlate HTTP access logs with user role assignments to identify requests that exceed granted privileges
Baseline typical Oracle Proposals request patterns per role and alert on deviations

Monitoring Recommendations

Forward Oracle E-Business Suite web tier and database audit logs to a centralized analytics platform for correlation
Enable Fine-Grained Auditing (FGA) on sensitive Oracle Proposals tables to capture read operations
Monitor privileged and service account activity against E-Business Suite for lateral access indicative of scope-change exploitation

How to Mitigate CVE-2026-83142

Immediate Actions Required

Apply the Oracle security patches referenced in the Oracle Security Alert CSPUSEP2026 to all affected Oracle E-Business Suite 12.2.3 through 12.2.15 environments
Inventory all E-Business Suite instances and identify those with Oracle Proposals enabled
Restrict network exposure of the E-Business Suite web tier to trusted networks and VPN access only
Audit existing low-privileged accounts and remove unnecessary access to Oracle Proposals

Patch Information

Oracle addressed CVE-2026-83142 through the security patches documented in the Oracle Security Alert CSPUSEP2026. Administrators should follow Oracle's standard E-Business Suite patching guidance and validate patch application in non-production environments prior to production rollout.

Workarounds

Disable the Oracle Proposals module in deployments where it is not required for business operations
Place a web application firewall (WAF) in front of the E-Business Suite web tier to inspect and restrict HTTP requests targeting Oracle Proposals endpoints
Enforce least privilege on E-Business Suite responsibilities and remove Oracle Proposals access from users who do not require it
Require multi-factor authentication for all E-Business Suite user access to raise the bar for attackers seeking low-privileged accounts

bash

# Example: restrict access to Oracle Proposals URLs at the reverse proxy
# Apache httpd configuration snippet placed in front of Oracle E-Business Suite
<Location "/OA_HTML/OKC">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Location>