2026年10月27日の
セキュリティ情報

Subject: [Security Advisory] Brotli Library Vulnerability (CVE-2026-111497)

Dear IT/Security Team,

We are sharing information regarding a critical vulnerability in the Brotli decompression library.

■ Overview
A buffer overflow vulnerability (CVE-2026-111497) has been identified in the Google-developed Brotli library. If exploited, this could lead to remote code execution (RCE) or system crashes.

■ Scope of Impact
- Products integrating the Brotli library, including Node.js, Python, and Microsoft software.
- According to Wiz researchers, a significant percentage of cloud environments may have exposed vulnerable Node.js instances.

■ Mitigation Steps
1. Identify all instances of Node.js, Python, and other software utilizing the Brotli library within your environment.
2. Apply the latest security patches provided by the respective vendors immediately.

■ Reference
- Node.js Security Advisory (published Oct 21)

Priority: High
Deadline: Immediate

Subject: [Security Advisory] GitLab Vulnerability Remediation

Dear IT/Security Team,

Multiple vulnerabilities have been identified in GitLab that could lead to Remote Code Execution (RCE), data confidentiality breaches, and security policy bypasses.

■ Scope
- GitLab Community Edition (CE) and Enterprise Edition (EE)
- 19.4.x before 19.4.3
- 19.5.x before 19.5.1
- Versions prior to 19.3.6

■ Remediation Steps
1. Verify the current version of your GitLab installation.
2. If an affected version is in use, immediately update to the patched versions (19.4.3, 19.5.1, or 19.3.6 and later).

■ Reference
- GitLab Official Security Bulletin

Priority: High
Deadline: Immediate

Subject: [Security Alert] Beware of Fake Claude AI Download Pages

Hi everyone,

We have been alerted to a phishing campaign where attackers use Google Ads to lead users to fake Claude AI download pages.

These pages are cleverly hosted on the legitimate claude.ai domain using sharing features, making them look official. However, they are designed to distribute malware.

What we need you to do:
1. Only download software from the official page: https://claude.com/download
2. Be cautious of links marked as "Ads" in Google search results.
3. If you have accidentally downloaded or executed a suspicious file, please contact the IT security team immediately.

Deadline: Immediate

Subject: [Security Alert] Malware Injection via Magento CMS Blocks

Dear IT/Security Team,

We are sharing information regarding a campaign targeting Magento stores using a stealthy injection technique.

■ Overview
Attackers are injecting malicious JavaScript directly into the 'cms_block' database table. By embedding the loader within the database rather than the theme files or core configuration, the attackers can evade standard file-system security scanners while maintaining persistence on the storefront.

■ Scope
- E-commerce stores running Magento CMS

■ Action Plan
1. Audit the 'cms_block' database table for unauthorized <script> tags or calls to unknown external domains.
2. Check for the presence of a 'fpCode' key in the browser's localStorage, which is used as a persistence mechanism in some cases.
3. Implement database integrity monitoring and restrict write access to the CMS tables to authorized administrators only.

■ Reference
- Sansec eComscan findings

Priority: High
Deadline: Immediate review recommended

Subject: [Alert] Password Reset for DreamHost Service Users

Hi everyone,

DreamHost, our web hosting provider, has reset passwords for some users as a protective measure due to a system issue.

What you need to do:
1. If you use DreamHost services (Email, FTP, etc.), please reset your password upon your next login.
2. If you used the same password for any other accounts, please change those passwords immediately.

Deadline: As soon as possible