2026年10月9日の
セキュリティ情報

Subject: [Security Alert] Strengthening Email Account Security

Dear employees,
It has been reported that threat actors are targeting organizational email accounts by guessing passwords to steal sensitive information.

Requested Actions:
1. Update your passwords to be complex and avoid reusing them across different services.
2. Ensure that Multi-Factor Authentication (MFA) is enabled on your account.
3. Report any suspicious login notifications or unauthorized email activity to the IT team.

Deadline: By the end of this week

Subject: [Security Advisory] Citrix NetScaler CVE-2026-107406 Mitigation

Dear Team,

We are sharing critical information regarding a vulnerability in Citrix NetScaler.

■ Overview
A memory overflow vulnerability (CVE-2026-107406) has been identified in NetScaler ADC and NetScaler Gateway. Successful exploitation could lead to Remote Code Execution (RCE) or Denial of Service (DoS). The CVSS score is 9.5 (Critical).

■ Scope
- Affected Products: NetScaler ADC, NetScaler Gateway
- Condition: Deployments configured as a SAML Identity Provider (IdP) or Service Provider (SP).

■ Action Plan
1. Verify if your instances are configured as SAML SP (add authentication samlAction) or SAML IdP (add authentication samlIdPProfile).
2. If applicable, apply the latest security patches provided by Citrix immediately.

■ Reference
- Citrix Official Security Advisory

Priority: High
Deadline: Immediate

Subject: [Security Advisory] HPE Intelligent Management Center CVE-2026-79842

Dear IT Administration Team,

We are sharing information regarding a critical vulnerability in HPE Intelligent Management Center (iMC).

■ Overview
An authentication bypass vulnerability (CVE-2026-79842) has been identified. This flaw could allow a remote attacker to bypass authentication mechanisms and gain unauthorized access to the system.

■ Scope
- Product: HPE Intelligent Management Center (iMC)
- Affected Versions: Versions prior to 7.3 E0713

■ Mitigation Steps
1. Verify the current version of your iMC installation.
2. If the version is affected, apply the latest security updates provided by the vendor.

■ Reference
- HPE Official Advisory: https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05157en_us

Priority: High
Deadline: Immediate

Subject: [Security Advisory] IBM Security Verify Access / Verify Identity Access Vulnerabilities

Dear IT/Security Team,

This is a notification regarding critical vulnerabilities identified in IBM security products.

■ Overview
IBM has addressed 22 vulnerabilities in Security Verify Access and Verify Identity Access. These include critical flaws allowing Remote Code Execution (RCE), authentication bypass, and arbitrary file writes. 5 vulnerabilities are rated 'Critical' and 5 are rated 'High'.

■ Affected Scope
- IBM Security Verify Access / Verify Identity Access 10.0.x (v10.0.9.2 and earlier)
- IBM Security Verify Access / Verify Identity Access 11.0.x (v11.0.3 and earlier)
- Container versions of the above products

■ Mitigation Steps
1. Verify the current version of the installed products.
2. Apply the latest security updates as specified in the IBM security bulletin.

■ Reference
- IBM Security Bulletins

Priority: High
Deadline: Immediate

Subject: [Urgent] Citrix NetScaler ADC/Gateway Vulnerabilities (CVE-2026-88771, CVE-2026-88772)

Dear IT/Security Team,

We are sharing critical information regarding vulnerabilities in Citrix NetScaler products.

■ Overview
Critical vulnerabilities (CVE-2026-88771 and CVE-2026-88772) have been discovered in Citrix NetScaler ADC and NetScaler Gateway. These flaws allow remote, unauthenticated attackers to execute arbitrary code. Active exploitation has been reported in the wild.

■ Scope
- Citrix NetScaler ADC
- Citrix NetScaler Gateway

■ Action Required
1. Verify the current version of your NetScaler appliances.
2. Immediately apply the latest security updates provided by Citrix.

■ Reference
- Citrix Official Security Advisory

Priority: High
Deadline: Immediate