Mastering Multi-Cloud Security

Dec 23, 2025Press Hits0 comments

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Originally Posted by Cyber Defense Magazine at https://www.cyberdefensemagazine.com/mastering-multi-cloud-security/

Multi-cloud computing has benefits and challenges. With flexibility, innovation, and cost control as some of its advantages, the most significant challenges it presents are in the realm of cybersecurity. Each cloud provider has its own architecture, tools, software componentry, and telemetry. This creates a fragmented ecosystem where vulnerabilities can lurk and threat actors can exploit gaps.

CISOs today recognize that multi-cloud environments pose this kind of risk, and the solution is to ensure visibility across environments, maintain consistency in policy enforcement, exception governance, and implement a layered approach to threat detection and response. Single-cloud rules no longer apply.

The Multi-Cloud Challenge: Complexity Without Consistency

Multi-cloud ecosystems can present inconsistency in how data, logs, and events are captured and managed. Whether it’s AWS, Azure, Google Cloud, or a niche SaaS vendor, each employs different formats and nomenclature for security events. This creates a challenge for centralizing monitoring, correlation, and response. In turn, this multiplies our operating costs for managing multiple cloud platforms.

Vendor-native tools, unfortunately, do not offer the consistent coverage that is necessary. They can provide value, but they are often limited in scope and lack the needed interoperability across providers. Therefore, relying solely on vendor-native tooling or open-source community edition tools results in blind spots, which are factors in detecting threat patterns and coordinating policy deviations across environments.

The imperative is for organizations to adopt vendor-agnostic policies and complement vendor-native security capabilities with third-party tools. Event logs should be normalized into a common format, thus allowing consistent monitoring, detection, and policy enforcement across cloud platforms.

Why Consistency Beats Convenience

Multi-cloud security requires both visibility and cohesion. With consistent capabilities across all cloud providers, it becomes easier to:

  • Apply uniform security controls.
  • Monitor for, and properly track, policy deviations.
  • Detect anomalies across services and workloads.
  • Prioritize risk based on real context.

Many fear that consistency and uniformity will negatively impact flexibility. However, flexibility will be maintained by designing and enforcing baseline security expectations across the multi-cloud landscape, and by utilizing Security Information Event Management (SIEM), Extended Detection Response (XDR), SBOM, observability, and third-party tools to monitor against that standard.

Logs Tell the Truth—If You Know How To Read Them

Cross-referencing operational logs and metadata across providers is wise. Doing this will uncover misconfigurations, timing anomalies, and coverage gaps that would otherwise go unnoticed.

By aligning log data from Azure and AWS for the same application, a CISO can discover issues such as one environment not capturing failed login attempts or unusual time gaps in log ingestion across platforms, which may be indicative of performance issues or malicious tampering.

These insights help security teams prioritize based on real risks, as opposed to a vendor dashboard that does not show a complete picture.

Avoid the Single Tool Fallacy

Having a single platform—especially a vendor-native or free tool—is unlikely to provide the holistic multi-cloud security required for optimal defense. These tools can be helpful in their native environments, but they can fall short when it comes to supporting interoperability. Real-time correlation or enterprise-grade support is often not available.

A layered, overlapping security approach, combining the following, is best:

  • Vendor-native tools for baseline protection.
  • Enterprise-grade third-party tools for unified visibility.
  • Cross-platform log aggregation and normalization.
  • Automation and AI-driven correlation across all environments.

If open-source tools are in use, it’s imperative to make sure that they are enterprise editions, with support, updates, and verified integrations.

The CISO’s Role In Multi-Cloud Security

Multi-cloud security is the domain of the CISO and their team – even for shadow IT. Securing the cloud assets is the goal, and that requires aligning policies, prioritizing remediation, and maintaining executive visibility into risks and compliance. This means that the CISO must proactively advocate for a budget, staffing, and the necessary tooling that a multi-cloud environment requires, as the severity of a breach can be significant. The CISO must also ensure that vendors have transparency, that security standards are enforced across procurement, and that third-party software aligns with internal risk frameworks.

Clarity Is Security

In 2024, the number of Common Vulnerabilities and Exposures (CVE) surged more than 38 percent compared to 2023. Many of these vulnerabilities were discovered in third-party software used by organizations that lacked visibility into their exposure until it was too late.

For CISOs managing multi-cloud environments, reacting to and recovering from breaches is far more painful than proactive visibility. The CISO must ensure that the organization they work for has a proactive and strategic approach when managing the complexities of the cloud.

The time to normalize logs, layer defenses, and demand more from providers is now, because in a multi-cloud world, clarity is security.

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