How Does CVE-2026-101767 Expose Oracle E-Business Suite to Unauthenticated RCE?

The short version

• An unauthenticated SQL injection in Oracle EBS enables remote code execution via the TCF servlet.
• The vulnerability affects versions 12.2.3 to 12.2.15 of the Application Object Library.
• Patches were issued by Oracle on 20 October 2026 as part of its quarterly update.

The details

Horizon3.ai researchers identified CVE-2026-101767 as a critical unauthenticated SQL injection flaw within Oracle E-Business Suite. The vulnerability exists in the Core component of the Oracle Application Object Library, specifically affecting versions 12.2.3 through 12.2.15. According to the Horizon3 report, attackers with network access to the Thin Client Framework servlet can execute SQL commands as the APPS database user.

This initial access allows them to chain the attack to execute operating system commands as the EBS application account. The flaw carries a CVSS 3.1 Base Score of 9.8, indicating severe impacts on confidentiality, integrity, and availability. Exploitation requires no authentication or user interaction, relying solely on HTTP or HTTPS access to the vulnerable endpoint.

The context

The vulnerable endpoint, located at /OA_HTML/AppsTCFServer and implemented by oracle.apps.fnd.tcf.SocketServer, is included in the default EBS URL firewall configuration. This means internet-facing web tiers are directly exposed to unauthenticated attacks. Internal deployments also face risk if an attacker reaches the servlet from a compromised system or accessible network segment. Successful exploitation grants access to application data such as financial, payroll, HR, and procurement records. Additionally, attackers gain command execution privileges governed by the permissions of the compromised EBS application account. Horizon3 disclosed this zero-day flaw to Oracle on 24 July 2026.

Next steps

Oracle addressed CVE-2026-101767 in its October 2026 Critical Patch Update, released on 20 October 2026. Administrators should apply the relevant patches using the Oracle E-Business Suite patch availability documentation referenced in advisory My Oracle Support Note KA923. As an immediate mitigation, teams can remove /OA_HTML/AppsTCFServer from the EBS URL firewall allowlist. Restricting access to the EBS web tier to trusted networks and applying access restrictions across untrusted paths also reduces exposure. These measures do not replace patching but help limit attack surface while updates are deployed.

What defenders should look for

Teams usually monitor for unauthenticated POST requests targeting the TCF servlet endpoint, followed by unusual backend database activity. Look for SQL reconnaissance patterns, such as queries checking database versions or current user privileges, occurring shortly after web traffic. Unexpected file creation in temporary directories or the oracle account spawning shell processes via the Concurrent Manager indicates potential compromise. Check whether the application host shows signs of command execution outside normal operational patterns. Verify that database logs reflect only expected query volumes from authorised services.

What to do and how to stay safe: Oracle

• Review web server logs for unauthenticated requests to the AppsTCFServer endpoint and block access if unpatched.
• Verify that your Oracle E-Business Suite version falls within the affected range and plan immediate patching.
• Monitor database audit logs for anomalous SQL activity originating from the application server IP addresses.
• Restrict network access to the EBS web tier to trusted internal segments until patches are applied.

Step-by-step guide: How Virtual Patching Works: The Mechanics Behind Inline Protection

General security guidance from the Honeypot Daily newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Which Oracle E-Business Suite versions are affected by CVE-2026-101767?

Versions 12.2.3 through 12.2.15 of the Oracle Application Object Library are affected.

Is there a patch available for this vulnerability?

Yes, Oracle released patches in its October 2026 Critical Patch Update on 20 October 2026.

Can this vulnerability be exploited without authentication?

Yes, the flaw allows unauthenticated attackers with network access to execute SQL and remote code.