CVE-2026-46818: Oracle E-Business Suite Payments File Transmission Vulnerability (CVSS 7.4)

Technical summary

CVE-2026-46818 is a CWE-284 (Improper Access Control) vulnerability affecting Oracle Payments within E-Business Suite. The flaw exists in the File Transmission component and can be exploited via HTTPS without authentication. Attack complexity is rated as high, meaning the attacker must overcome non-trivial conditions—such as specific system configuration, timing, or knowledge of internal implementation details—to succeed. The CVSS 3.1 score of 7.4 reflects high confidentiality and integrity impact with no availability impact. The vulnerability does not require user interaction or privilege escalation.

Business impact

Organizations running Oracle E-Business Suite versions 12.2.3–12.2.15 face risk of unauthorized access to and modification of payment data, vendor information, and financial records. This threatens data confidentiality, transaction integrity, and regulatory compliance (PCI-DSS, SOX, HIPAA depending on use context). Even with difficult exploitation conditions, a determined threat actor could compromise payment processes, alter transaction records, or exfiltrate sensitive financial intelligence. The lack of authentication requirement elevates organizational exposure if systems are internet-facing.

Affected systems

Oracle E-Business Suite versions 12.2.3, 12.2.4, 12.2.5, 12.2.6, 12.2.7, 12.2.8, 12.2.9, 12.2.10, 12.2.11, 12.2.12, 12.2.13, 12.2.14, and 12.2.15 are in scope. The vulnerability is isolated to the Payments product module and its File Transmission component. Organizations must identify EBS instances running these versions and assess network exposure of the HTTPS endpoint handling file transmission.

Exploitability

Exploitation is classified as difficult. While no authentication is required and network access via HTTPS is sufficient, the attack complexity (AC:H) means the attacker faces material obstacles—likely requiring deep knowledge of the File Transmission implementation, specific system states, or timing dependencies. The vulnerability has not been added to CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating no evidence of active exploitation in the wild as of the publication date. However, the network-accessible, unauthenticated attack vector ensures this will attract researcher attention once patching lags.

Remediation

Apply Oracle's security patches for CVE-2026-46818 to affected E-Business Suite instances. Oracle typically releases patches via monthly Critical Patch Update (CPU) releases; verify the June 2026 CPU or subsequent patch bundles for file transmission fixes targeting your specific version. Organizations unable to patch immediately should prioritize network segmentation—restrict HTTPS access to the Payments File Transmission endpoint to trusted internal networks or VPN-only access. Implement WAF rules if available to detect and block suspicious file transmission requests. Audit file transmission logs for anomalous access patterns or unauthorized modifications to payment data.

Patch guidance

Obtain the applicable Oracle E-Business Suite patch from Oracle Support. The vulnerability affects versions 12.2.3–12.2.15; verify against the vendor advisory that your target version is included in the patch bundle. Test patches in a non-production environment before deployment, as EBS patches can affect broader system functionality. Plan for maintenance windows; E-Business Suite patches typically require application server restart. Prioritize patching based on your system's network exposure and role in payment processing workflows. If your organization is on an Extended Support or Sustaining Support phase, confirm patch availability before relying on a specific release schedule.

Detection guidance

Monitor HTTPS connections to the Oracle Payments File Transmission endpoint for requests originating from unusual IP addresses or lacking expected authentication tokens. Enable Oracle E-Business Suite audit logging for the Payments module, specifically tracking file upload, download, and modification events. Search application and web server logs for HTTP 4xx/5xx errors in payment transmission paths, which may indicate exploitation attempts. Use network intrusion detection to flag suspicious patterns in HTTPS traffic to the Payments service. Implement file integrity monitoring on payment data tables to detect unauthorized modifications. Correlate authentication logs to identify unauthenticated sessions that accessed sensitive payment records.

Why prioritize this

This vulnerability merits prompt attention due to its direct impact on financial data integrity and the unauthenticated, network-accessible attack vector. While exploitation difficulty is high, the sensitivity of payment systems and potential for data exfiltration or fraudulent modification justify rapid patching. The absence from the KEV catalog should not lower vigilance; academic or private research may already have developed reliable exploitation techniques. Organizations with internet-facing EBS instances or third-party vendor access to Payments should prioritize this within their critical patch windows.

Risk score, explained

The CVSS 3.1 base score of 7.4 (HIGH severity) reflects the combination of network accessibility, lack of authentication requirements, high confidentiality impact (C:H), and high integrity impact (I:H). The high attack complexity (AC:H) and lack of availability impact prevent a critical or maximum rating. For most organizations processing payments, the business context elevates practical risk beyond the base score—unauthorized modification of financial records carries significant liability and compliance penalties. Environmental scoring should account for system network exposure and role in revenue or compliance workflows.

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