Microsoft Cloud App Security (MCAS) Review

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Microsoft entered the CASB market in earnest with the acquisition of Adallom in late 2015. Microsoft Cloud App Security (MCAS) is now a reverse-proxy-plus-API CASB available as a standalone offering and also as part of Microsoft’s Enterprise Mobility + Security (EMS) suite. Microsoft Cloud App Security is targeted at organizations of all sizes.

Notable features

  • Microsoft Cloud App Security is a user-based subscription service. Each license is a per user, per month license. Microsoft Cloud App Security can be licensed as a standalone product or as part of several different bundles, depending on organizational size and needs. Customers can also choose to license feature subsets of Microsoft Cloud App Security.
  • The service integrates with various Microsoft products to deliver capabilities such as integration with Microsoft Defender Advanced Threat Protection, which provides a single click deployment to enable the Discovery of Shadow IT directly from devices from within?and outside of the corporate network.

Supported platforms and applications

Natively built into the Microsoft cloud platforms: Office 365 and Azure. Featured connectors support Box, Dropbox, Salesforce, ServiceNow, AWS, G-suite, Okta, Cisco WebEx, Workday, Workiva, Workplace by Facebook, Tableau, Slack, JIRA/Confluence, GitHub, Egnyte, CornerStone, Concur and others. Microsoft Cloud App Security supports any cloud app in proxy mode, allowing customers to onboard any public or LOB apps to its protection platform. In addition, on premises apps can also be integrated via the proxy, using Azure AD App Proxy.

Size limits

No limits

Security certifications

CSA Star (Gold level), EU-U.S. Privacy Shield, FISC, HIPAA/HITECH, ISO 9001, ISO/IEC 27001, ISO/IEC 27018, PCI DSS, SOC 1 and SOC 2 Type 2, SOC 3, UK G-Cloud

Delivery method

Cloud Service

Technology (API, proxy or hybrid)

Hybrid (API + Proxy) and log collection

Additional features

Microsoft Cloud App Security can take advantage of Microsoft Flow, enabling customers to use more than 200 first- and third-party connectors to automate the triage of alerts.


Cloud App Security is available for purchase as a subscription for $5 per user per month as the estimated retail price. It is also a component of Microsoft Mobility + Security E5.

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