CVE-2026-83130: Oracle Site Hub Auth Bypass Vulnerability

CVE-2026-83130 Overview

CVE-2026-83130 is an improper access control vulnerability [CWE-284] in the Oracle Site Hub product of Oracle E-Business Suite. The flaw resides in the Internal Operations component and affects supported versions 12.2.3 through 12.2.15. A low-privileged attacker with network access over HTTP can exploit the weakness without user interaction. Successful exploitation grants unauthorized create, delete, or modify access to all Oracle Site Hub accessible data, plus unauthorized read access to a subset of that data. Oracle disclosed the issue in the Oracle Security Alert CSPUSEP2026 advisory.

Critical Impact
Authenticated attackers can tamper with all Oracle Site Hub data and read a subset of accessible records over the network, compromising the integrity of E-Business Suite site management processes.

Affected Products

Oracle E-Business Suite — Oracle Site Hub 12.2.3
Oracle E-Business Suite — Oracle Site Hub versions 12.2.4 through 12.2.14
Oracle E-Business Suite — Oracle Site Hub 12.2.15

Discovery Timeline

2026-09-15 - CVE-2026-83130 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-83130

Vulnerability Analysis

The vulnerability affects the Internal Operations component of Oracle Site Hub, a module of Oracle E-Business Suite used to manage physical and logical site records. Oracle classifies the issue as easily exploitable over the network via HTTP. The attacker requires only low-level authenticated access to the application, with no user interaction. Impact concentrates on integrity, with high integrity impact and low confidentiality impact reported by Oracle. Availability is not affected, so services continue running while data is silently altered. The scope is unchanged, meaning damage is bounded to the Oracle Site Hub security context.

Root Cause

The underlying weakness is classified as improper access control [CWE-284]. The Internal Operations component fails to enforce sufficient authorization checks on requests that create, modify, delete, or read Site Hub data. As a result, a user holding any valid low-privilege session token can invoke operations that should be reserved for privileged roles.

Attack Vector

Exploitation requires network access to the Oracle E-Business Suite HTTP interface and a valid low-privilege account. The attacker sends crafted HTTP requests to Site Hub endpoints in the Internal Operations component. Because the missing check is server-side, standard browser or scripted HTTP tooling is sufficient to trigger the flaw. No exploit code is publicly available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Oracle Security Alert CSPUSEP2026 for vendor technical details.

Detection Methods for CVE-2026-83130

Indicators of Compromise

Unexpected create, update, or delete operations on Oracle Site Hub records performed by low-privileged user accounts.
HTTP requests to Site Hub Internal Operations endpoints originating from user sessions that do not normally interact with site management workflows.
Application audit log entries showing modifications to site master data outside of scheduled business processes.

Detection Strategies

Enable and review Oracle E-Business Suite Sign-On Audit and Page Access Tracking for Site Hub responsibilities.
Correlate Oracle HTTP Server access logs with Site Hub database change events to identify unauthorized write operations.
Baseline normal Site Hub API call volume per user role and alert on deviations, especially from accounts with minimal assigned responsibilities.

Monitoring Recommendations

Forward Oracle E-Business Suite application, database, and web tier logs to a centralized SIEM for retention and correlation.
Monitor for privilege changes and new responsibility assignments granting access to Site Hub Internal Operations.
Alert on repeated HTTP 200 responses to Site Hub write endpoints from accounts that historically issued only read requests.

How to Mitigate CVE-2026-83130

Immediate Actions Required

Apply the Oracle Critical Patch Update referenced in Oracle Security Alert CSPUSEP2026 to all affected Oracle E-Business Suite environments running versions 12.2.3 through 12.2.15.
Inventory user accounts with access to Oracle Site Hub responsibilities and remove entitlements that are not required.
Review recent Site Hub data changes for signs of unauthorized modification and restore from backup where tampering is confirmed.

Patch Information

Oracle addressed CVE-2026-83130 in the security update tracked by Oracle Security Alert CSPUSEP2026. Administrators should install the patch bundle corresponding to their Oracle E-Business Suite 12.2.x release level and validate that Site Hub Internal Operations functions correctly after deployment.

Workarounds

Restrict network access to the Oracle E-Business Suite HTTP interface using firewall rules, VPN gating, or reverse-proxy allow-lists until patching completes.
Temporarily revoke Site Hub responsibilities from non-essential user accounts to reduce the pool of accounts that satisfy the low-privilege precondition.
Enable enhanced application-level auditing on Site Hub tables and forms to increase the likelihood of detecting exploitation attempts.