Microsoft Entra OAuth Client ID spoofing campaign
Campaign
Summary
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A Microsoft Entra ID targeting campaign is using OAuth Client ID spoofing to evade Entra sign-in logs and gain stealthy access to cloud services, increasing the chance that malicious logins go undetected. Proofpoint says it has tracked multiple large-scale campaigns affecting millions of user accounts across thousands of tenants. The activity relies on the ROPC flow and blank application fields to obscure authentication attempts.
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H score37
First: 09.07.2026 17:39
Last: 09.07.2026 17:39
Sources 1
About this happening:
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Campaign
H score46
First: 25.05.2026 15:45
Last: 25.05.2026 15:45
Sources 1
About this happening:
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Campaign
H score33
First: 19.05.2026 22:35
Last: 19.05.2026 22:35
Sources 1
About this happening:
The **Storm-2949** campaign is targeting **Microsoft 365 and Azure production environments** to steal sensitive data, increasing the risk of privileged-account takeover and cloud...
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Campaign
H score39
First: 19.05.2026 14:30
Last: 19.05.2026 14:30
Sources 1
About this happening:
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Campaign
H score43
First: 04.04.2026 17:17
Last: 04.04.2026 17:17
Sources 1
About this happening:
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Timeline
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13.07.2026 16:00 2 articles · 2h ago
OAuth client ID spoofing evades Microsoft Entra ID sign-in logs
Initial DisclosureProofpoint describes attackers using OAuth client ID spoofing against Microsoft Entra ID to hide malicious authentication activity in Entra sign-in logs. The technique relies on POST requests to Microsoft's OAuth 2.0 token endpoint with the Resource Owner Password Credentials (ROPC) flow, spoofed IDs, and blank application fields, allowing operators to infer valid usernames and passwords, identify accounts that can be exploited, and potentially bypass detection while targeting cloud environments. Proofpoint also says it has tracked multiple large-scale campaigns affecting millions of user accounts across thousands of Microsoft Entra tenants, and advises defenders to treat blank application IDs, missing application names, and AADSTS700016 errors as possible indicators of client ID spoofing.
Show sources
- Novel OAuth Client ID Spoofing Technique Targets Cloud Environments — www.infosecurity-magazine.com — 13.07.2026 16:00
- Novel OAuth Client ID Spoofing Technique Targets Cloud Environments — www.infosecurity-magazine.com — 13.07.2026 16:00