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NodeZero attack-graph card from Horizon3 showing a single hop from the NodeZero tester to the exploited weakness CVE-2026-101767, labeled EBS TCF SQLi RCE, with a green PROOF badge and a PERIMETER BREACH banner.
Image: Horizon3.ai, NodeZero Rapid Response attack graph for CVE-2026-101767 (fair use).

Response

Attackers Begin Probing the Critical Oracle E-Business Suite Flaw CVE-2026-101767 a Week After the Patch, and Horizon3 Says the Fix or the URL Firewall Allowlist Is the Only Thing Standing in the Way

Defused says its decoys recorded exploratory exploits against the unauthenticated SQL-injection-to-RCE flaw in the EBS Thin Client Framework servlet on Oct. 27, days after Oracle's Oct. 20 patch. Horizon3, which reported the bug in July, rates it 9.8 and says removing /OA_HTML/AppsTCFServer from the EBS URL firewall allowlist buys time until the October Critical Patch Update is applied.

Noah Park, ResponseNew York5 min read

NEW YORK - Attackers have started probing the internet for a critical Oracle E-Business Suite flaw that Oracle patched only last week, the threat intelligence firm Defused said, giving defenders a narrow window to apply the October update or pull the vulnerable servlet off the public internet.

The flaw, CVE-2026-101767, carries a CVSS score of 9.8. Horizon3.ai, whose attack research team found it and reported it to Oracle on July 24, describes it as an unauthenticated SQL injection in the Oracle E-Business Suite Thin Client Framework that chains to remote code execution. Oracle fixed it in its October 2026 Critical Patch Update, released Oct. 20.

"Our Oracle E-Business Suite decoys recorded exploratory exploits against CVE-2026-101767, an unauthenticated SQL injection in EBS's Thin Client Framework servlet that chains to remote code execution, this morning, Oct 27," Defused wrote on X. The company labeled its alert a first detection and noted that it had seen no confirmed in-the-wild compromise yet, only probes against the GanttDataServer trigger surface at /OA_HTML/AppsTCFServer.

Defused first-detection card marked HIGH: "Oracle E-Business Suite TCF servlet probed for CVE-2026-101767 (GanttDataServer)," noting that Horizon3's unauthenticated SQLi-to-RCE has no confirmed in-the-wild exploitation yet and that Defused decoys are observing exploratory probes against its GanttDataServer trigger surface at /OA_HTML/AppsTCFServer.
Image: Defused (@DefusedCyber) first-detection alert, Oct. 27, 2026 (fair use).

What the servlet exposes

Horizon3 identifies the affected product as Oracle Application Object Library and the entry point as the TCF servlet at /OA_HTML/AppsTCFServer, implemented by oracle.apps.fnd.tcf.SocketServer. That endpoint is allowed through the default EBS URL firewall configuration, and exploitation needs only network access over HTTP or HTTPS, with no authentication or user interaction.

An attacker who reaches the servlet can run SQL as the APPS database user and then run operating system commands as the EBS application account. "Depending on the deployment, affected data may include financial, payroll, HR, and procurement records. Operating system access is governed by the permissions of the compromised EBS application account," Horizon3 wrote. Internet-facing web tiers carry the most direct exposure, but Horizon3 warns that internal deployments are also at risk if an attacker can reach the servlet from another compromised system.

Horizon3 advisory text for CVE-2026-101767 listing affected versions, Oracle E-Business Suite 12.2.3 through 12.2.15 inclusive, and the fix in the October 2026 Critical Patch Update released on Oct. 20, 2026, applied through My Oracle Support Note KA923.
Image: Horizon3.ai advisory, affected versions and patch (fair use).

Patch, or take the servlet off the allowlist

Horizon3 says Oracle Application Object Library is affected in Oracle E-Business Suite versions 12.2.3 through 12.2.15, inclusive, and that the October 2026 Critical Patch Update, out Oct. 20, contains the fix, applied through the patch availability documentation in My Oracle Support Note KA923. Until the patch is installed, Horizon3 recommends removing /OA_HTML/AppsTCFServer, which maps to oracle.apps.fnd.tcf.SocketServer, from the EBS URL firewall allowlist, restricting the web tier to trusted networks, and monitoring the application host and database for signs of compromise. It adds that those steps reduce exposure but do not replace patching.

Horizon3 mitigations and indicators of compromise for CVE-2026-101767, including removing the AppsTCFServer servlet from the URL firewall allowlist, and watching for unauthenticated POST requests that instantiate the GanttDataServer class followed by database activity, SQL reconnaissance after unauthenticated web requests, and the oracle account spawning /bin/sh through the Concurrent Manager.
Image: Horizon3.ai advisory, mitigations and indicators of compromise (fair use).

For hunters, Horizon3 lists three indicators of compromise: unauthenticated POST requests to /OA_HTML/AppsTCFServer that instantiate the Gantt data-server class oracle.apps.jtf.gantt.server.GanttDataServer, followed by backend database activity; SQL reconnaissance shortly after unauthenticated web requests, such as checks of the database version, current user, or directory objects; and unexpected files in $APPLPTMP together with the oracle account spawning /bin/sh through the Concurrent Manager to run operating system commands.

A short runway

How much exposure exists is not precisely known. The internet watchdog Shadowserver now tracks more than 670 internet-exposed Oracle EBS instances, most with US addresses, though it does not say how many are honeypots or already patched. Oracle, in guidance that accompanied the October update, said some past compromises happened because customers had not applied available patches, and urged them to patch without delay.

Oracle EBS has been a repeated target. Since August 2025 the Clop extortion crew has exploited a separate EBS flaw, CVE-2025-61882, against victims that included Logitech, the Washington Post, and several US universities, and Oracle issued emergency mitigations in June for a PeopleSoft zero-day, CVE-2026-35273, that the ShinyHunters group used. For CVE-2026-101767, there is a patch and a clear set of workarounds. The probing Defused reported is the signal to use them now.

Sources:


Noah Park covers incident response and blue-team operations for SOCtember from New York.

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