> Microsoft Authentication (MSAL.js) signs users in with Microsoft accounts: what it does on a website, the browser storage it uses and the GDPR angle. > > Canonical: https://www.flowconsent.com/en/services/security/microsoft-authentication Security # Microsoft Authentication Essential · [Official website](https://github.com/AzureAD/microsoft-authentication-library-for-js) Microsoft Authentication refers to the Microsoft Authentication Library for JavaScript (MSAL.js), which lets web applications sign users in with Microsoft Entra ID or Microsoft accounts and obtain tokens for Microsoft APIs. It stores authentication data in browser storage and may use cookies, as part of a login the user requested. [Block Microsoft Authentication until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=security) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Security](https://www.flowconsent.com/en/services/security) - Consent Essential - Prior consent Required - Documented cookies 0 Compliance ## Microsoft Authentication and the GDPR Microsoft Authentication is classified as “Essential”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What Microsoft Authentication sets and contacts The cookies of Microsoft Authentication are not documented in the catalog yet. To see what is actually set on your site, run a free scan. [Scan my site](https://www.flowconsent.com/en/scan) Same category ## More services: Security [See the whole category](https://www.flowconsent.com/en/services/security) ### [DigiCert](https://www.flowconsent.com/en/services/security/digicert) [DigiCert is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. DigiCert supports modern development practices and scales with growing business needs. 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