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Microsoft Blocks External Scripts in Entra ID Logins

First seen 28 Nov 2025, 06:35 UTC • •26.3

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ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft has implemented a security update to its Entra ID sign-in process, blocking external scripts during user logins. This change aims to prevent unauthorized code execution on the login page and is part of the company's Secure Future Initiative. The update will be included in a 2026 CSP update.

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2 entities, 1 inferred relationships (STIX 2.1).

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Affected Platform (1)

Entra ID

Vulnerability (1)

XSS

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XSS targets Entra ID

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