Oracle E-Business Suite Flaw CVE-2026-101809 Scores CVSS 10.0

TL;DR

Oracle fixed a CVSS 10.0 E-Business Suite vulnerability, CVE-2026-101809, in its October 2026 Critical Patch Update. The flaw lets an unauthenticated attacker take over the Workflow product over HTTP. Oracle shipped 193 more E-Business Suite fixes in the same release.

Why It Matters

E-Business Suite runs finance, payroll, procurement, and supply chain operations for large firms. Consequently, it stores some of the most sensitive data a company owns.

Attackers have targeted it before. In 2025, a data theft and extortion campaign abused E-Business Suite flaw CVE-2025-61882. Many victims learned of the breach only when extortion emails arrived.

This new E-Business Suite vulnerability shares key traits with that bug. It needs no login, it works over HTTP, and it can lead to full compromise.

CVE-2026-101809 in Detail

The flaw sits in the Workflow Notification Mailer component of the Workflow product. This component sends and processes approval emails across E-Business Suite.

Oracle calls the bug “easily exploitable” by an “unauthenticated attacker with network access via HTTP.” Success can result in “takeover of Workflow.” The advisory also notes a scope change. In other words, attacks “may significantly impact additional products.”

Because Workflow touches nearly every E-Business Suite module, a takeover here could reach the wider suite.

Other Critical E-Business Suite Flaws

CVE-2026-101767 deserves equal attention. It affects the Core of the Application Object Library, the foundation that every module relies on. An unauthenticated attacker can exploit it over HTTP to take over the component.

The Wider Picture

All 194 E-Business Suite patches affect versions 12.2.3 through 12.2.15. Most of them, 140 in total, require a low-privileged account. In contrast, 31 are remotely exploitable without any login.

Some modules received many fixes. Mobile Field Service leads with 18 patches, followed by Payroll with 12 and Applications Manager with 8. These numbers come from the Oracle risk matrix.

E-Business Suite is the second-largest family in this Oracle Critical Patch Update. Only Fusion Middleware has more patches.

How the Attack Works

An attacker sends crafted HTTP requests to an exposed E-Business Suite instance. No user interaction is needed. Oracle has not released further technical details, and no public exploit code has been confirmed.

Exposure is the deciding factor. Instances that face the internet, for example for supplier or employee self-service portals, carry the highest risk.

Patch and Mitigation Steps

Apply the October 2026 patches to every E-Business Suite 12.2.x instance. Prioritize CVE-2026-101809 and CVE-2026-101767.

Until patches are in place, follow these steps:

1. Remove E-Business Suite from direct internet access where possible.
2. Restrict access to Workflow and Application Object Library endpoints with a web application firewall or reverse proxy rules.
3. Review web server and Workflow Mailer logs for unusual requests.

Oracle lists all fixes in its October 2026 advisory.

The Bottom Line

CVE-2026-101809 is the most severe E-Business Suite vulnerability in this release. Given the 2025 extortion campaign, organizations should not wait. Patch internet-facing instances first, and check them for signs of compromise.

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Written by

@DdoS · Security Researcher

Do Son

Do Son is the Founder and Editor of SecurityOnline.info. Working in cybersecurity since 2013, he reports on vulnerabilities, malware, and emerging threats, providing timely analysis to help organizations and individuals stay ahead of evolving risks.