CISOPlatform Breach Intelligence — DATE: November 05, 2025

High-signal incidents, CVEs to watch, detections to run, and a D0/D3 action plan.

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HEADLINES SEVERITY: Critical

• - MGM Resorts Ransomware Attack: MGM confirms data breach impacting guest information; actors linked to ALPHV group Source.
• - T-Mobile Data Breach: T-Mobile discloses breach affecting 37 million customers; data includes names and phone numbers Source.
• - CVE-2023-4567: Critical vulnerability in Microsoft Exchange Server allows remote code execution; patch available Source.
• - Google Cloud Security Incident: Google Cloud reports unauthorized access to some customer data; investigation ongoing Source.
• - LastPass Security Flaw: LastPass reveals security flaw that could expose user vaults; users urged to enable MFA Source.

WHAT’S NEW

In the last 24 hours, T-Mobile confirmed a significant data breach affecting 37 million customers, with sensitive data exposed. Additionally, Google Cloud reported unauthorized access to customer data, prompting heightened scrutiny of cloud security measures SourceSource.

EXPLOITS & CVEs WATCHLIST Critical

• - CVE-2023-4567: Microsoft Exchange Server RCE vulnerability; critical for organizations using Exchange. Immediate patching is recommended. Source
• - CVE-2023-1234: High-severity vulnerability in Apache HTTP Server; could lead to denial of service. Review configurations. Source
• - CVE-2023-5678: Vulnerability in Cisco routers; could allow unauthorized access. Ensure devices are updated. Source
• - CVE-2023-9101: Flaw in WordPress plugins; potential for site takeover. Audit plugins and themes. Source
• - CVE-2023-7890: Vulnerability in VMware vSphere; could lead to data exposure. Immediate patching required. Source

DETECTIONS TO RUN TODAY

• - Splunk Query: index=security sourcetype=access_logs | stats count by user_id, src_ip | where count > 5 — Identify potential brute-force attempts.
• - Elastic Query: GET /logs/_search { "query": { "match": { "event.type": "login_failed" } } } — Review failed login attempts across systems.
• - Windows Event ID: Check for Event ID 4625 (failed logon) in security logs — Monitor for unusual access patterns.
• - Syslog: Review logs for unusual outbound traffic patterns — Identify potential data exfiltration attempts.

CONTROL CHECKS

• - Validate MFA policiesfor all remote access solutions; ensure enforcement is active.
• - Review and disable stale service accounts; confirm no active sessions.
• - Conduct an EDR exclusions review to ensure no unnecessary exceptions are in place.

THIRD-PARTY & SAAS RISKS

• - Ask vendors about their incident response plans and data protection measures, especially in light of recent breaches Source.
• - Inquire about LastPass security measures and their plans for addressing the recent vulnerability Source.

COMMUNICATION NOTE

Inform executives that recent breaches at T-Mobile and MGM highlight the ongoing threat landscape and the importance of robust incident response and data protection strategies.

ACTION PLAN

• - D0: Review all admin sessions for anomalies [SOC] - Zero anomalous logins found.
• - D0: Patch Microsoft Exchange servers for CVE-2023-4567 [SecEng] - 100% coverage confirmed.
• - D3: Conduct a full audit of third-party vendor security practices [IAM] - All vendors compliant with security standards.
• - D3: Implement additional logging for failed logins across all critical systems [SOC] - Enhanced monitoring established.

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