CVE-2026-46798: Oracle WebCenter Sites Auth Bypass Flaw

CVE-2026-46798 Overview

CVE-2026-46798 is a critical vulnerability in Oracle WebCenter Sites, a component of Oracle Fusion Middleware. The flaw allows an unauthenticated attacker with network access over HTTP to fully compromise the product. Oracle disclosed the issue in the June 2026 Critical Patch Update advisory. The vulnerability is categorized under [CWE-306] Missing Authentication for Critical Function. Affected versions are 12.2.1.4.0 and 14.1.2.0.0. Because the scope changes during exploitation, successful attacks can impact additional products beyond WebCenter Sites itself.

Critical Impact
Unauthenticated remote attackers can take over Oracle WebCenter Sites and pivot to additional products due to scope change, with full loss of confidentiality, integrity, and availability.

Affected Products

Oracle WebCenter Sites 12.2.1.4.0
Oracle WebCenter Sites 14.1.2.0.0
Oracle Fusion Middleware deployments incorporating the above versions

Discovery Timeline

2026-06-17 - CVE-2026-46798 published to NVD
2026-06-17 - Last updated in NVD database
June 2026 - Oracle releases fix in the Oracle Critical Patch Update Advisory

Technical Details for CVE-2026-46798

Vulnerability Analysis

The flaw resides in the WebCenter Sites component of Oracle Fusion Middleware. Oracle classifies the issue as easily exploitable by an unauthenticated attacker over HTTP. The CWE mapping of [CWE-306] indicates that a critical function is reachable without authentication. Successful exploitation results in full takeover of the WebCenter Sites instance. The scope change indicator means the impact extends beyond the vulnerable component to other resources in the same security authority. Confidentiality, integrity, and availability are all fully impacted on success.

Root Cause

The root cause is missing authentication on a critical function exposed by WebCenter Sites. An attacker reaching the HTTP listener can invoke privileged operations without supplying valid credentials. Because the operation crosses a trust boundary, the attacker gains control over resources managed by adjacent Fusion Middleware components.

Attack Vector

The attack vector is network-based and requires no user interaction or prior privileges. An attacker sends crafted HTTP requests directly to the WebCenter Sites endpoint. Public proof-of-concept code is not available at the time of publication, and the EPSS probability stands at 0.483%. Oracle has not disclosed exploit specifics in the public advisory.

No verified exploitation code is publicly available. Refer to the Oracle Critical Patch Update Advisory for vendor-provided technical detail.

Detection Methods for CVE-2026-46798

Indicators of Compromise

Unauthenticated HTTP requests to WebCenter Sites administrative or content management endpoints originating from unexpected source addresses.
New or modified administrator accounts, content templates, or asset definitions within WebCenter Sites without a corresponding change record.
Outbound connections initiated from the WebCenter Sites host to unfamiliar external destinations following inbound HTTP activity.

Detection Strategies

Inspect web server and reverse proxy logs for anomalous request paths targeting WebCenter Sites services, particularly endpoints not normally invoked by anonymous users.
Correlate authentication logs with administrative actions to identify privileged operations that lack a preceding authenticated session.
Compare deployed Oracle Fusion Middleware patch levels against the June 2026 Oracle CPU baseline to identify unpatched hosts.

Monitoring Recommendations

Forward WebCenter Sites application, access, and audit logs to a centralized analytics platform for correlation across Fusion Middleware components.
Alert on process execution and file write activity by the WebCenter Sites application server account that deviates from established baselines.
Monitor network egress from middleware hosts and flag connections to non-allowlisted destinations.

How to Mitigate CVE-2026-46798

Immediate Actions Required

Apply the fixes from the Oracle Critical Patch Update of June 2026 to all WebCenter Sites 12.2.1.4.0 and 14.1.2.0.0 deployments.
Restrict network access to WebCenter Sites HTTP endpoints to trusted management networks until patching is complete.
Review administrator accounts, scheduled tasks, and recently modified content in WebCenter Sites for signs of tampering.

Patch Information

Oracle addressed CVE-2026-46798 in the June 2026 Critical Patch Update. Administrators should consult the Oracle Security Alert for the exact patch identifiers applicable to versions 12.2.1.4.0 and 14.1.2.0.0. Apply the patches in a staged environment before rolling them into production. Reboot affected middleware services to ensure the updated code paths are loaded.

Workarounds

Place WebCenter Sites behind a web application firewall configured to block unauthenticated access to administrative URIs.
Enforce network segmentation so that only authorized application tiers can reach the WebCenter Sites HTTP listener.
Disable or firewall off any externally exposed WebCenter Sites instance that is not strictly required for business operations.

bash

# Example: restrict WebCenter Sites HTTP listener to a management subnet using iptables
iptables -A INPUT -p tcp --dport 8080 -s 10.20.30.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP