CVE-2026-83102: Oracle Forms Auth Bypass Vulnerability

CVE-2026-83102 Overview

CVE-2026-83102 is an access control vulnerability [CWE-284] in the Oracle Forms component of Oracle Fusion Middleware. The flaw resides in Forms Services, specifically the Client/Server (C/S) and Charmode subcomponents. An unauthenticated attacker with network access over HTTP can compromise Oracle Forms, though exploitation is rated as difficult. Successful attacks allow unauthorized read, creation, deletion, or modification of critical data accessible through Oracle Forms. Oracle disclosed the vulnerability in its September 2026 Security Alert cycle.

Critical Impact
Unauthenticated network attackers can gain read and write access to all Oracle Forms accessible data, exposing sensitive enterprise application content to compromise.

Affected Products

Oracle Fusion Middleware — Oracle Forms version 12.2.1.19.0
Oracle Fusion Middleware — Oracle Forms version 14.1.2.0.0
Forms Services subcomponents: C/S and Charmode

Discovery Timeline

2026-09-15 - CVE-2026-83102 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database
September 2026 - Oracle publishes remediation guidance in the Oracle Security Alert September 2026

Technical Details for CVE-2026-83102

Vulnerability Analysis

The vulnerability affects Oracle Forms, a component of Oracle Fusion Middleware used to build enterprise data-entry applications. The defect resides in Forms Services under the Client/Server (C/S) and Charmode subcomponents. An unauthenticated attacker reaching the service over HTTP can trigger the flaw without user interaction.

Successful exploitation grants attackers unauthorized read access to critical data and the ability to create, delete, or modify records exposed through Oracle Forms. Availability is not impacted, but confidentiality and integrity of application data are fully compromised. Oracle notes that exploitation is difficult, which reflects preconditions outside the attacker's direct control such as timing, configuration, or specific transactional state.

The EPSS model currently assigns this issue a low probability of near-term exploitation, but the network-reachable, unauthenticated nature of the flaw makes it a priority for internet-exposed deployments.

Root Cause

The underlying weakness is classified as Improper Access Control [CWE-284]. Forms Services fails to enforce sufficient authorization checks on requests handled by the C/S and Charmode paths, allowing an unauthenticated network client to invoke operations that should be restricted to authorized sessions.

Attack Vector

The attack vector is network-based over HTTP. No credentials and no user interaction are required. An attacker crafts HTTP requests targeting the Oracle Forms Services endpoint to reach the affected C/S and Charmode handling logic, then abuses the missing access control to read or manipulate Forms-accessible data.

No verified proof-of-concept code or public exploit is available for CVE-2026-83102 at the time of publication. Refer to the Oracle Security Alert September 2026 for authoritative technical details.

Detection Methods for CVE-2026-83102

Indicators of Compromise

Unexpected HTTP requests to Oracle Forms Services endpoints from untrusted source addresses, particularly those targeting Client/Server or Charmode handlers.
Anomalous create, update, or delete operations on Forms-managed records without a corresponding authenticated session in application logs.
Spikes in outbound data volume from Oracle Forms hosts that correlate with unauthenticated inbound HTTP sessions.

Detection Strategies

Correlate web server access logs for Forms Services with Forms application audit logs to identify request patterns that lack an authenticated session context.
Baseline normal Forms Services traffic sources, methods, and URI patterns, then alert on deviations targeting C/S or Charmode paths.
Enable database auditing on tables exposed through Oracle Forms to detect data modifications that do not map to a legitimate application workflow.

Monitoring Recommendations

Forward Oracle Fusion Middleware and WebLogic access logs to a centralized SIEM for continuous review and long-term retention.
Monitor perimeter and reverse-proxy logs for HTTP requests to Forms Services originating from outside expected administrative networks.
Track failed and successful authorization decisions in Forms application logs to surface access control bypass attempts.

How to Mitigate CVE-2026-83102

Immediate Actions Required

Inventory all Oracle Fusion Middleware deployments running Oracle Forms 12.2.1.19.0 or 14.1.2.0.0 and identify any instances reachable from untrusted networks.
Apply the fixes published in the Oracle Security Alert September 2026 during the next available maintenance window.
Restrict network access to Forms Services endpoints so that only authorized clients and administrative networks can reach them over HTTP.
Review Forms application and database audit logs for evidence of unauthorized data access or modification prior to patching.

Patch Information

Oracle addressed CVE-2026-83102 in its September 2026 Security Alert. Administrators should download and apply the patches referenced in the Oracle Security Alert September 2026 for the affected Oracle Forms versions. Oracle strongly recommends applying Critical Patch Update and Security Alert fixes without delay because unresolved issues in supported products can be targeted by threat actors.

Workarounds

Place Oracle Forms Services behind an authenticating reverse proxy or web application firewall that enforces source-based access controls until patching is complete.
Disable or restrict exposure of the Client/Server (C/S) and Charmode subcomponents where they are not required by production workloads.
Apply network segmentation and firewall rules that limit inbound HTTP access to Forms Services to trusted management and application subnets.

bash

# Example network restriction using iptables to allow only trusted subnet access
# Replace 10.0.0.0/24 with your authorized management subnet and 9001 with the Forms Services port
iptables -A INPUT -p tcp --dport 9001 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9001 -j DROP