CVE-2026-83093: Oracle Forms Authentication Bypass Vulnerability

CVE-2026-83093 Overview

CVE-2026-83093 is an access control vulnerability [CWE-284] in the Oracle Forms component of Oracle Fusion Middleware. The flaw resides in Forms Services, C/S, Charmode and affects supported versions 12.2.1.19.0 and 14.1.2.0.0. An unauthenticated attacker with network access over HTTP can exploit the vulnerability without user interaction. Successful exploitation grants unauthorized access to critical data or complete access to all Oracle Forms accessible data. The scope-changed nature of the flaw means exploitation may impact additional products beyond Oracle Forms itself.

Critical Impact
Unauthenticated remote attackers can compromise confidentiality of all Oracle Forms accessible data over HTTP, with potential impact extending to adjacent Oracle Fusion Middleware components.

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-2026-83093 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-83093

Vulnerability Analysis

The vulnerability is categorized as improper access control [CWE-284] within Oracle Forms Services running in client/server character mode (C/S, Charmode). An attacker reaches the vulnerable code path over HTTP without credentials and without user interaction. The confidentiality impact is rated High while integrity and availability are unaffected, indicating an information disclosure primitive rather than data manipulation or service disruption.

Oracle's advisory notes a scope change, meaning exploitation crosses the security boundary of Oracle Forms and can affect resources managed by other components in the Fusion Middleware stack. This behavior is consistent with a shared session, token, or authorization context that Oracle Forms exposes to downstream services. The Exploit Prediction Scoring System (EPSS) currently reports a probability of 0.416%.

Root Cause

The underlying weakness is improper enforcement of access controls in the Forms Services HTTP handling path. Requests that should require authentication or authorization checks are processed without the necessary validation, exposing data protected by the Forms runtime. Because Oracle has not published the internal code changes, technical specifics beyond the CWE classification and advisory summary are not publicly available.

Attack Vector

The attack vector is network-based (AV:N) with low complexity (AC:L) and requires no privileges or user interaction. An attacker sends crafted HTTP requests to a reachable Oracle Forms Services endpoint. The scope-changed CVSS designation (S:C) indicates the compromise reaches beyond Forms into adjacent Fusion Middleware resources.

No public proof-of-concept exploit is currently listed for CVE-2026-83093. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-provided technical context and remediation details.

Detection Methods for CVE-2026-83093

Indicators of Compromise

Unauthenticated HTTP requests to Oracle Forms Services endpoints returning application data payloads.
Anomalous spikes in outbound response sizes from Forms Services listeners.
Access log entries with missing or unusual session identifiers reaching Forms C/S, Charmode handlers.
Cross-component data access originating from the Forms Services process context that lacks a preceding authentication event.

Detection Strategies

Enable verbose HTTP access logging on Oracle HTTP Server and WebLogic managed servers fronting Oracle Forms, and alert on requests to Forms endpoints without authenticated session cookies.
Correlate Forms Services process activity with Fusion Middleware audit logs to identify scope-crossing data reads.
Deploy web application firewall rules that require authentication headers on Forms Services URIs and log violations.

Monitoring Recommendations

Ingest WebLogic, Oracle HTTP Server, and Forms Services logs into a centralized SIEM for correlation.
Baseline normal Forms Services request volume and alert on deviations, particularly from external network ranges.
Track failed and anomalous authorization decisions in Fusion Middleware audit trails for post-patch verification.

How to Mitigate CVE-2026-83093

Immediate Actions Required

Inventory all Oracle Fusion Middleware deployments running Oracle Forms 12.2.1.19.0 or 14.1.2.0.0.
Apply the patches referenced in the Oracle Security Alert CSPUSEP2026 as soon as feasible.
Restrict network access to Oracle Forms Services endpoints to trusted management and application networks only.
Review HTTP access logs for the past 90 days for unauthenticated requests to Forms endpoints.

Patch Information

Oracle has published fixes in the out-of-cycle Security Alert CSPUSEP2026. Consult the Oracle Security Alert CSPUSEP2026 for the specific patch identifiers, prerequisite bundles, and installation guidance that correspond to Oracle Forms 12.2.1.19.0 and 14.1.2.0.0.

Workarounds

Place Oracle Forms Services behind a reverse proxy or WAF that enforces authentication prior to reaching the Forms runtime.
Segment Fusion Middleware hosts so that Forms Services cannot be reached directly from untrusted networks.
Disable unused Forms Services listener configurations, including C/S, Charmode where not required by business processes.
Increase Fusion Middleware audit log retention to support forensic review while patches are staged.

bash

# Configuration example: restrict Forms Services access at the network layer
# (Adapt to your firewall or reverse proxy technology)
iptables -A INPUT -p tcp --dport 9001 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 9001 -j DROP