2026年9月13日の
セキュリティ情報

Subject: [Security Alert] Critical Vulnerabilities in ICS (Schneider Electric, Siemens, etc.)

Dear IT/Security Team,

This is a notification regarding the September 2026 security updates for major Industrial Control System (ICS) vendors.

■ Overview
Critical vulnerabilities have been identified in products from Schneider Electric and Siemens. Specifically, CVE-2026-3869 (CVSS 9.2) allows authentication bypass, potentially granting attackers full control over OT systems. Additionally, CVE-2026-31431 allows local privilege escalation to root in Siemens' Linux-based components.

■ Affected Scope
- Schneider Electric: PowerLogic T300, EcoStruxure IT Data Center Expert, SCADAPack x70
- Siemens: Reyrolle 7SR5, Open Interface Services (OIS), Industrial Edge Management, SIMOVE
- Other affected products from AVEVA and Rockwell Automation

■ Action Plan
1. Identify if any of the affected ICS products/versions are deployed within the environment.
2. Apply the September 2026 security patches provided by the respective vendors.
3. Verify system stability and authentication mechanisms post-patching.

■ Reference
- ThaiCERT Advisory
- Vendor Official Security Portals

Priority: High
Deadline: Immediate

Subject: [Action Required] Please Update Your Browser and Software

Hi everyone,
Critical vulnerabilities have been discovered in several widely used software products, including web browsers, and some are being actively exploited.

What we need you to do:
1. If you see an update notification for your browser (e.g., Chrome), please restart it immediately to apply the update.
2. Ensure all pending OS and business software updates are installed on your machine.

Deadline: End of today

Subject: [Urgent] Action Required: Fortinet FortiOS/FortiSwitchManager CVE-2025-25249

Dear IT/Security Team,

We are sharing critical information regarding a vulnerability in Fortinet products.

■ Overview
A critical Heap-based Buffer Overflow vulnerability (CVE-2025-25249, CVSS 9.8) has been identified in FortiOS and FortiSwitchManager, allowing unauthenticated Remote Code Execution (RCE). Active exploitation has been detected, involving the deployment of the PivotC2 RAT for network reconnaissance and system control.

■ Affected Scope
- Fortinet FortiOS
- FortiSwitchManager

■ Mitigation Steps
1. Identify all deployed instances of FortiOS and FortiSwitchManager and check current versions.
2. Immediately update the affected devices to the latest patched versions provided by Fortinet.
3. Review system logs for signs of compromise, such as unauthorized configuration changes or unusual outbound traffic associated with PivotC2 RAT.

■ Reference
- ThaiCERT Advisory
- Fortinet Official Security Advisory

Priority: High
Deadline: Immediate

Subject: [Security Alert] Response to 'FortiBleed' Attacks Targeting Fortinet Products

Dear IT/Security Team,

We are sharing information regarding 'FortiBleed,' a large-scale credential theft campaign targeting Fortinet devices.

■ Overview
Attackers are using AI-driven tools to compromise FortiGate management interfaces and SSL VPN gateways. Over 70,000 devices globally have been affected, providing attackers with a primary entry point for full internal network compromise.

■ Scope
- Affected Products: Fortinet FortiGate (Firewall, SSL VPN Gateway)

■ Action Plan
1. Update all FortiGate devices to the latest stable firmware version.
2. Restrict access to management interfaces; ensure they are not exposed to the public internet.
3. Enforce Multi-Factor Authentication (MFA) for all SSL VPN users.
4. Review authentication logs for unauthorized access attempts from suspicious IP addresses.

■ Reference
- Fortinet Official Security Advisories

Priority: High
Deadline: Immediate

Subject: [Urgent] GitLab CVE-2026-85706 (CVSS 10.0) Remediation

Dear IT/Security Team,

We are sharing critical information regarding a vulnerability in GitLab.

■ Overview
A path traversal vulnerability (CVE-2026-85706) has been identified in GitLab's repository commits API. This flaw allows unauthenticated attackers to read arbitrary files, potentially exposing SSH keys, database credentials, and CI/CD variables. The CVSS score is 10.0.

■ Scope
- Affected Product: GitLab (versions utilizing the repository commits API)

■ Action Plan
1. Immediately update GitLab to the latest patched version.
2. Review API access logs for signs of path traversal attempts or unauthorized file access.
3. If a breach is suspected, rotate all sensitive credentials, including SSH keys and deploy tokens.

■ Reference
- CISA Known Exploited Vulnerabilities (KEV) Catalog
- GitLab Official Security Advisory

Priority: High
Deadline: Immediate