2026年10月28日の
セキュリティ情報

Subject: [Urgent] Oracle E-Business Suite Vulnerability (CVE-2026-101767) Mitigation

Dear IT/Security Team,

We are sharing critical information regarding a vulnerability in Oracle E-Business Suite (EBS).

■ Overview
A critical SQL injection vulnerability (CVE-2026-101767, CVSS 9.8) has been identified in the Application Object Library. This flaw allows unauthenticated remote attackers to achieve Remote Code Execution (RCE) via HTTP. Active probing by threat actors has already been observed.

■ Scope
- Product: Oracle E-Business Suite (EBS)
- Component: Application Object Library

■ Mitigation Steps
1. Immediately apply the relevant patches provided in Oracle's October Critical Patch Update (CPU).
2. Monitor web server and application logs for suspicious HTTP requests targeting the Application Object Library.

■ Reference
- Oracle October CPU Advisory

Priority: High
Deadline: Immediate

Subject: [Urgent] Vulnerabilities in Adobe Commerce and Google Brotli (CVE-2026-48356 / CVE-2026-111497)

Hi team,

This is a technical alert regarding two critical vulnerabilities recently added to CISA's KEV catalog.

■ Overview
Active exploitation has been observed for CVE-2026-48356 (CVSS 9.3) in Adobe Commerce/Magento, which allows unrestricted file uploads leading to arbitrary code execution. Additionally, CVE-2026-111497 (CVSS 9.2) in Google's Brotli library can lead to memory corruption and potential remote code execution.

■ Scope
- Adobe Commerce / Magento
- Google Brotli decoder library

■ Action Plan
1. Immediately apply the latest security patches for Adobe Commerce/Magento.
2. Update Google Brotli library to the latest patched version across all affected environments.
3. Audit server logs and file systems for signs of compromise, such as unauthorized web shells.

■ Reference
- CISA Known Exploited Vulnerabilities (KEV) Catalog

Priority: High
Deadline: Immediate

Subject: [Security Advisory] Critical Vulnerability in EDK II (UEFI) Firmware

Dear IT Administration Team,

We are sharing information regarding a critical vulnerability found in EDK II, the open-source foundation for most UEFI firmware.

■ Overview
A flaw in the network boot process allows an attacker to execute arbitrary code before the operating system loads, bypassing Secure Boot and other startup defenses. The attack is launched via crafted network messages during the network boot window from an adjacent network position.

■ Scope
- Servers utilizing EDK II-based UEFI firmware with network booting enabled.
- Systems shipping affected code from vendors such as Red Hat and SUSE.

■ Mitigation Steps
1. Identify and apply the latest UEFI firmware updates provided by your hardware vendors.
2. Disable network booting (PXE) in BIOS/UEFI settings if it is not required for operations.
3. Implement strict network segmentation for environments where network booting is mandatory.

■ Reference
- TianoCore Official Advisory (Published Oct 22)

Priority: High
Deadline: Next scheduled maintenance window

Subject: [Security Advisory] Brotli (Node2Shell) CVE-2026-111497 Mitigation

Dear Team,

This is a technical alert regarding the vulnerability in the Brotli compression library (CVE-2026-111497).

■ Overview
An out-of-bounds write vulnerability in the Brotli decoder allows attackers to cause application crashes, leak memory contents, or potentially achieve arbitrary code execution (RCE) via specially crafted compressed data. This vulnerability has been added to CISA's KEV catalog, indicating active exploitation in the wild.

■ Affected Scope
- Brotli versions 1.0.3 through 1.2.0
- Impacted products: Node.js, Google, Microsoft (Python packages), Bun, Envoy, Istio, and PAN-OS.

■ Mitigation Steps
1. Identify all instances of the affected Brotli library versions within your environment.
2. Apply the latest security updates provided by the respective vendors immediately.

■ Reference
- CISA KEV Catalog
- Vendor security advisories

Priority: High
Deadline: November 10, 2026 (CISA deadline)

Subject: [Action Required] Update your Microsoft Edge Browser

Hi everyone,

A vulnerability has been reported in Microsoft Edge that could allow an attacker to take control of your computer if you visit a malicious website.

What we need you to do:
1. Please update Microsoft Edge to the latest version immediately.
2. Go to 'Settings' -> 'About Microsoft Edge' to check for updates and restart the browser if prompted.

Deadline: End of today