CVE-2026-83104: Oracle Forms Authentication Bypass Vulnerability

CVE-2026-83104 Overview

Oracle disclosed CVE-2026-83104, an authentication weakness [CWE-287] affecting the Oracle Forms product within Oracle Fusion Middleware. The flaw resides in the Forms Services, C/S, Charmode component. An unauthenticated remote attacker with network access via TCP can compromise Oracle Forms without user interaction. Successful exploitation grants unauthorized read, create, delete, or modify access to all Oracle Forms accessible data.

Critical Impact
An unauthenticated attacker can compromise confidentiality and integrity of all Oracle Forms accessible data over the network with low attack complexity.

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-2026-83104 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database
2026-09-15 - Oracle publishes Security Alert CSPUSEP2026 covering this CVE

Technical Details for CVE-2026-83104

Vulnerability Analysis

CVE-2026-83104 is an improper authentication weakness in the Oracle Forms Services Client/Server Character Mode component. The affected code path accepts requests over TCP without adequately verifying caller identity. An unauthenticated attacker with network reachability to the Oracle Forms service can invoke privileged operations that should require authentication.

The result is a break in the trust boundary between remote clients and the Forms Services runtime. Attackers can perform arbitrary reads and modifications against data exposed by Oracle Forms. Availability is not impacted, but confidentiality and integrity of the Forms data store are both fully compromised.

Oracle rates the issue as easily exploitable and requiring no user interaction. The EPSS probability is 0.404% as of 2026-09-16, indicating limited observed exploitation attempts so far. That likelihood typically rises after vendor patch publication as attackers reverse-engineer fixes.

Root Cause

The root cause is missing or insufficient authentication [CWE-287] on a network-facing Oracle Forms service. Requests routed to the C/S Charmode component are processed without enforcing identity verification. This allows attackers to reach code paths intended for authenticated Forms sessions.

Attack Vector

Exploitation requires only network access to the Oracle Forms TCP listener. No credentials, no prior foothold, and no user interaction are needed. Attackers craft protocol messages to the Forms Services endpoint and receive privileged access to Forms data. Environments exposing Oracle Forms outside the internal network are at highest risk.

No public proof-of-concept exploit code has been published. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-provided technical details.

Detection Methods for CVE-2026-83104

Indicators of Compromise

Unexpected TCP connections to Oracle Forms Services listeners from external or non-application-tier sources.
Forms Services log entries showing sessions established without corresponding successful authentication events.
Unexplained data modifications, deletions, or exports within tables surfaced through Oracle Forms.
Spikes in Forms C/S Charmode traffic outside normal business processing windows.

Detection Strategies

Correlate Forms Services access logs against authentication logs to identify sessions lacking a valid login event.
Deploy network signatures for anomalous Oracle Forms protocol traffic on TCP ports assigned to the Forms listener.
Baseline normal Forms client source IPs and alert on new or unexpected clients invoking Charmode sessions.
Audit database change logs for Forms-driven data operations that do not map to a known application user.

Monitoring Recommendations

Forward Oracle Fusion Middleware, WebLogic, and Forms Services logs into a centralized SIEM for correlation.
Monitor the Forms Services TCP listener for connection volume anomalies and repeated malformed requests.
Track privileged data operations on tables and views accessible through Oracle Forms.
Alert on any change to Forms Services configuration files or listener parameters.

How to Mitigate CVE-2026-83104

Immediate Actions Required

Apply the fixes described in the Oracle Security Alert CSPUSEP2026 to all affected Oracle Forms deployments.
Inventory all Oracle Forms 12.2.1.19.0 and 14.1.2.0.0 installations, including test and staging environments.
Restrict network access to Oracle Forms TCP listeners to trusted application tiers only.
Review Forms Services and database audit logs for signs of unauthorized data access since 2026-09-15.

Patch Information

Oracle addressed CVE-2026-83104 in the Security Alert CSPUSEP2026 published on 2026-09-15. Administrators must apply the vendor-supplied patch bundle to Oracle Forms 12.2.1.19.0 and 14.1.2.0.0. Confirm patch application against the version banners returned by the Forms Services runtime after restart. Full remediation details are available in the Oracle Security Alert CSPUSEP2026.

Workarounds

Place Oracle Forms listeners behind a firewall that restricts TCP access to the application middle tier only.
Disable the Forms Services C/S Charmode component if it is not required by production workflows.
Enforce network segmentation so that Forms Services is unreachable from user workstations and untrusted networks.
Require VPN or zero-trust network access for any administrator connecting to Forms Services endpoints.

bash

# Example: restrict Oracle Forms TCP listener to trusted application tier subnet
# (replace 9001 with the actual Forms Services listener port and 10.0.20.0/24 with the app tier CIDR)
iptables -A INPUT -p tcp --dport 9001 -s 10.0.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9001 -j DROP