Microsoft Entra Agent ID Logs Reveal Suspicious Assistive Agent Activity

Cybersecuritynews •Tushar Subhra Dutta • June 9, 2026

AI agents built into enterprise platforms are no longer just productivity tools. Security researchers have found that these agents, when configured to act on behalf of real users, can become a quiet but serious risk deep inside an organization’s identity layer. A new investigation reveals how Microsoft Entra Agent ID logs capture suspicious behavior tied […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Microsoft Entra Agent ID Logs Expose Risky Assistive Agent Activity Microsoft Entra Agent ID logs have revealed a significant security risk involving assistive agents utilizing the OAuth On-Behalf-Of (OBO) flow. These agents can act with delegated user privileges, potentially performing harmful actions like sending external emails. In a specific incident, an email titled 'Here is your invoice' was flagged in Exchange Purview, indicating misuse of these capabilities. Organizations relying on Microsoft Entra may be vulnerable to this threat, as it allows agents to operate under the guise of legitimate users. The investigation highlights the need for enhanced monitoring and security measures around assistive agents. Security researchers emphasize that this behavior could lead to unauthorized data exposure or phishing attempts. The current status of the threat is under investigation, with no confirmed exploitation reported yet. 2 sources 52

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Microsoft Entra