CVE-2026-83204: Oracle Sourcing Auth Bypass Vulnerability

CVE-2026-83204 Overview

CVE-2026-83204 is a high-severity access control vulnerability [CWE-284] in the Oracle Sourcing 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 via HTTP can exploit this vulnerability to compromise Oracle Sourcing, resulting in full takeover of the product. Successful exploitation impacts confidentiality, integrity, and availability. Oracle disclosed the issue in the September 2026 Security Alert.

Critical Impact
Successful exploitation allows a low-privileged network attacker to fully take over Oracle Sourcing, compromising confidentiality, integrity, and availability of business-critical procurement data.

Affected Products

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

Discovery Timeline

2026-09-15 - CVE-2026-83204 published to NVD
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-83204

Vulnerability Analysis

The vulnerability affects the Internal Operations component of Oracle Sourcing, a module within Oracle E-Business Suite used to manage sourcing and procurement negotiations. Exploitation requires an authenticated session with low privileges and network reachability to the HTTP interface of the application. Oracle classifies the attack as difficult to exploit, indicating specialized conditions or timing must be met to succeed. Once achieved, the attacker gains full takeover of Oracle Sourcing.

Because the vulnerability is categorized under Improper Access Control [CWE-284], the underlying weakness likely permits an authenticated user to perform operations or reach resources that should be restricted. This class of flaw commonly enables lateral privilege escalation within an application tier without requiring memory corruption or code injection.

Root Cause

Oracle has not published deep technical details beyond the CWE classification and CVSS metrics. The root cause maps to Improper Access Control [CWE-284] within the Internal Operations component. Authorization checks appear insufficient to prevent a low-privileged user from invoking operations reserved for higher-privileged principals.

Attack Vector

The attack originates over the network via HTTP against the Oracle E-Business Suite web tier. The attacker must hold valid low-privileged credentials for the target instance. No user interaction is required. Because the scope is unchanged, the compromise is contained within Oracle Sourcing but yields high impact across confidentiality, integrity, and availability of that product.

No public proof-of-concept exploit is available at time of publication. Refer to the Oracle Security Alert for September 2026 for authoritative technical details.

Detection Methods for CVE-2026-83204

Indicators of Compromise

Unexpected HTTP requests to Oracle Sourcing endpoints under /OA_HTML/ originating from low-privileged user sessions performing administrative or internal operations.
Anomalous privilege changes, sourcing document modifications, or supplier record alterations attributed to accounts without corresponding business roles.
Session activity from Oracle E-Business Suite user accounts accessing Internal Operations functionality outside of documented business workflows.

Detection Strategies

Audit Oracle E-Business Suite application logs (FND_LOG_MESSAGES, FND_UNSUCCESSFUL_LOGINS) for authorization anomalies and role escalation events in the Sourcing module.
Correlate web tier access logs against user role assignments to identify requests to Internal Operations endpoints from accounts lacking corresponding responsibilities.
Baseline normal Oracle Sourcing HTTP traffic patterns and alert on deviations, particularly requests to administrative servlets or JSP pages from non-administrative sessions.

Monitoring Recommendations

Forward Oracle E-Business Suite application, database audit, and web tier logs to a centralized SIEM for continuous correlation.
Enable Oracle Fine-Grained Auditing (FGA) on sourcing-related tables to record privileged data reads and writes.
Monitor for outbound data movement from Oracle Sourcing hosts that could indicate exfiltration following a takeover.

How to Mitigate CVE-2026-83204

Immediate Actions Required

Apply the patches referenced in the Oracle Security Alert for September 2026 to all Oracle E-Business Suite instances running Sourcing versions 12.2.3 through 12.2.15.
Review and reduce user responsibilities in Oracle Sourcing, revoking low-privileged accounts that do not require access to the module.
Restrict network exposure of the Oracle E-Business Suite web tier to trusted internal networks and VPN users only.

Patch Information

Oracle addressed CVE-2026-83204 in the September 2026 Security Alert. Administrators should download and apply the vendor-provided patches for affected Oracle E-Business Suite 12.2.x versions. Consult the Oracle Security Alert for September 2026 for patch identifiers, prerequisites, and installation instructions specific to each supported release.

Workarounds

Place the Oracle E-Business Suite web tier behind a web application firewall configured to block requests to Internal Operations endpoints from unauthorized user sessions until patches are deployed.
Enforce strict role and responsibility hygiene: audit all Sourcing users and remove unnecessary access rights that could satisfy the low-privilege exploitation prerequisite.
Enable multi-factor authentication for all Oracle E-Business Suite accounts to raise the bar for credential-based prerequisites to exploitation.

bash

# Example: Query Oracle EBS for users with Sourcing responsibilities to review access
# Run as APPS schema user
SELECT fu.user_name, frt.responsibility_name, furg.start_date, furg.end_date
FROM   fnd_user fu
       JOIN fnd_user_resp_groups furg ON fu.user_id = furg.user_id
       JOIN fnd_responsibility_tl frt ON furg.responsibility_id = frt.responsibility_id
WHERE  frt.responsibility_name LIKE '%Sourcing%'
  AND  (furg.end_date IS NULL OR furg.end_date > SYSDATE)
ORDER  BY fu.user_name;