CVE-2026-83179: Oracle E-Business Suite Auth Bypass Flaw

CVE-2026-83179 Overview

CVE-2026-83179 is an access control vulnerability [CWE-284] in the Oracle Common Applications Calendar component of Oracle E-Business Suite. The flaw affects supported versions 12.2.3 through 12.2.15. A low-privileged attacker with network access via HTTP can compromise the Applications Calendar component. Successful exploitation enables unauthorized creation, deletion, or modification of critical data. Attackers can also gain complete read access to Calendar-accessible data and cause partial denial of service. Oracle rates the attack complexity as high, meaning exploitation requires specific conditions beyond standard authenticated access.

Critical Impact
Authenticated attackers can achieve full read and write access to Oracle Common Applications Calendar data and trigger partial denial of service on the component.

Affected Products

Oracle E-Business Suite 12.2.3 through 12.2.15
Oracle Common Applications Calendar (Applications Calendar component)
Deployments exposing the Applications Calendar over HTTP to authenticated users

Discovery Timeline

2026-09-15 - CVE-2026-83179 published to NVD
2026-09-17 - Last updated in NVD database
Oracle Security Alert CSPUSEP2026 - Referenced in Oracle Security Alert CSPUSEP2026

Technical Details for CVE-2026-83179

Vulnerability Analysis

The vulnerability resides in the Oracle Common Applications Calendar, a shared component used across Oracle E-Business Suite modules for scheduling and calendar services. Oracle classifies the issue under [CWE-284] Improper Access Control. Exploitation grants an authenticated attacker the ability to read, modify, or delete any data accessible to the Calendar component. The attack complexity is high, which indicates the attacker must satisfy conditions outside their direct control, such as timing, configuration state, or specific data relationships. The vulnerability is exploitable remotely over HTTP without user interaction.

Root Cause

The root cause is improper access control within the Applications Calendar component. Authorization checks fail to correctly restrict operations on Calendar objects belonging to other users or tenants. A low-privileged account with valid E-Business Suite credentials can bypass these checks and reach data or actions outside its intended scope. Oracle has not published detailed technical specifics beyond the security alert.

Attack Vector

Exploitation requires network access to the Oracle E-Business Suite HTTP interface and a low-privileged authenticated session. The attacker interacts with Applications Calendar endpoints using crafted requests that leverage the missing authorization checks. No user interaction is required from an administrator or victim. Successful requests allow enumeration, retrieval, modification, or deletion of Calendar records, and can degrade component availability. Refer to the Oracle Security Alert CSPUSEP2026 for vendor guidance on affected code paths.

Detection Methods for CVE-2026-83179

Indicators of Compromise

Unexpected create, update, or delete operations against Applications Calendar tables performed by low-privileged accounts.
HTTP requests to Calendar endpoints originating from user sessions that should not access those resources.
Anomalous spikes in Calendar API errors or latency consistent with partial denial of service.
Access to Calendar records belonging to users or organizations outside the caller's assigned scope.

Detection Strategies

Enable and review Oracle E-Business Suite audit logging for the Common Applications Calendar module.
Correlate user role assignments with Calendar object access to flag out-of-scope reads or writes.
Baseline normal HTTP request patterns to Calendar endpoints and alert on deviations by low-privileged users.
Monitor database-level activity on Calendar schema tables for modifications made outside expected application workflows.

Monitoring Recommendations

Forward Oracle E-Business Suite application, middleware, and database logs into a centralized SIEM for correlation.
Track authentication events alongside Calendar-related HTTP requests to identify low-privilege session abuse.
Alert on repeated failed authorization events or unusual bulk data operations against Calendar tables.

How to Mitigate CVE-2026-83179

Immediate Actions Required

Apply the patches referenced in Oracle Security Alert CSPUSEP2026 to all affected E-Business Suite environments.
Inventory all Oracle E-Business Suite 12.2.3 through 12.2.15 deployments and confirm patch status.
Restrict network exposure of the E-Business Suite HTTP tier to trusted networks and VPN users only.
Review and reduce the number of accounts with access to the Applications Calendar component.

Patch Information

Oracle addressed CVE-2026-83179 in the security alert tracked as CSPUSEP2026. Administrators should review the Oracle Security Alert CSPUSEP2026 advisory for the specific patch bundles that apply to their E-Business Suite release. Apply patches in a staged environment first, validate Calendar functionality, then roll to production.

Workarounds

Limit Calendar component access at the web tier using Oracle HTTP Server rewrite or access control rules until patches are applied.
Reduce responsibilities and menu entries that expose Applications Calendar functionality to non-essential users.
Enable Oracle E-Business Suite Sign-On Audit and Page Access Tracking to increase visibility into Calendar activity.
Place the E-Business Suite HTTP tier behind a web application firewall configured to inspect Calendar endpoint traffic.

bash

# Example: restrict access to Applications Calendar URIs at Oracle HTTP Server
# Add to httpd.conf or a mod_rewrite include file, then reload the web tier
<LocationMatch "/OA_HTML/.*[Cc]alendar.*">
    Order deny,allow
    Deny from all
    Allow from 10.0.0.0/8
    Allow from 192.168.0.0/16
</LocationMatch>