CVE-2026-83107: Oracle Forms Privilege Escalation Flaw

CVE-2026-83107 Overview

CVE-2026-83107 is an improper access control vulnerability [CWE-284] in the Oracle Forms product of Oracle Fusion Middleware. The flaw resides in the Forms Services, C/S, Charmode component. Affected versions include Oracle Forms 12.2.1.19.0 and 14.1.2.0.0.

An authenticated attacker with high privileges and network access via HTTP can compromise Oracle Forms. Successful exploitation results in complete takeover of Oracle Forms. The vulnerability carries a scope change, meaning attacks may significantly impact additional products beyond the vulnerable component.

Critical Impact
Successful exploitation allows a high-privileged remote attacker to fully compromise Oracle Forms with cascading impact on connected products due to scope change.

Affected Products

Oracle Fusion Middleware — Oracle Forms 12.2.1.19.0
Oracle Fusion Middleware — Oracle Forms 14.1.2.0.0
Component: Forms Services, C/S, Charmode

Discovery Timeline

2026-09-15 - CVE-2026-83107 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-83107

Vulnerability Analysis

CVE-2026-83107 is an improper access control weakness in Oracle Forms Services, specifically in the Client/Server (C/S) Charmode component. The vulnerability allows an attacker who already holds high privileges to bypass intended access restrictions and take over the Oracle Forms deployment.

Because the vulnerability produces a scope change, exploitation impacts components outside the vulnerable Forms process. The confidentiality, integrity, and availability of connected Oracle Fusion Middleware services can all be affected. The Exploit Prediction Scoring System (EPSS) currently rates this issue at 0.475% with a percentile of 39.97 as of 2026-09-16.

Root Cause

The root cause is improper enforcement of access controls [CWE-284] in the Forms Services, C/S, Charmode component. Oracle Forms fails to correctly restrict privileged operations exposed to authenticated users, permitting an actor with existing high privileges to escalate control over the Forms runtime and reach adjacent components.

Attack Vector

The attack is delivered over the network using HTTP against the Oracle Forms service. Attack complexity is low and no user interaction is required, but the attacker must already possess high privileges within the environment. The vulnerability manifests when the attacker issues crafted HTTP requests to abuse the exposed Forms functionality.

No verified proof-of-concept exploit code has been published. Refer to the Oracle Security Alert CSPUSEP2026 for authoritative technical guidance.

Detection Methods for CVE-2026-83107

Indicators of Compromise

Unexpected HTTP requests to Oracle Forms Services endpoints originating from privileged accounts or unusual internal hosts.
Anomalous Forms Runtime process behavior, including spawning of child processes or new outbound network connections.
Modifications to Forms configuration files, application module (.fmx) files, or environment settings outside change windows.
Authentication events for high-privileged Forms accounts from atypical source addresses or at atypical times.

Detection Strategies

Correlate authentication logs with Forms Services HTTP access logs to identify privileged sessions performing administrative operations.
Baseline normal Oracle Forms runtime behavior and alert on deviations such as new process trees, file writes, or lateral network activity.
Deploy web application firewall (WAF) rules to flag malformed or unexpected requests to Forms Services URIs.

Monitoring Recommendations

Continuously ingest Oracle Fusion Middleware, WebLogic, and Forms Services logs into a centralized SIEM for correlation and retention.
Monitor privileged account usage against Oracle Forms and alert on new administrative role assignments.
Track outbound network connections from Forms Services hosts to detect post-compromise lateral movement across Fusion Middleware components.

How to Mitigate CVE-2026-83107

Immediate Actions Required

Apply the Oracle security patch referenced in the Oracle Security Alert CSPUSEP2026 to all affected Oracle Forms 12.2.1.19.0 and 14.1.2.0.0 deployments.
Inventory all Oracle Fusion Middleware installations and confirm which hosts run the Forms Services, C/S, Charmode component.
Rotate credentials for high-privileged Oracle Forms accounts and audit recent privileged session activity.
Restrict network reachability of Oracle Forms HTTP endpoints to trusted management networks only.

Patch Information

Oracle has published guidance and remediation as part of Oracle Security Alert CSPUSEP2026. Administrators should apply the vendor-provided patches for Oracle Forms 12.2.1.19.0 and 14.1.2.0.0 immediately. Review the alert for specific patch bundle identifiers and prerequisite updates for Oracle Fusion Middleware.

Workarounds

Enforce strict network segmentation so Oracle Forms Services endpoints are only reachable from trusted administrative subnets.
Reduce the number of accounts granted high privileges within Oracle Forms and Fusion Middleware to shrink the exploitation surface.
Enable enhanced HTTP request logging and WAF inspection in front of Oracle Forms until patches are fully deployed.
Disable the Forms Services, C/S, Charmode component in environments where it is not required for business operations.

bash

# Configuration example: restrict inbound HTTP access to Oracle Forms Services
# Replace with your Forms Services host and management subnet
iptables -A INPUT -p tcp --dport 9001 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9001 -j DROP