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VERIFIEDConfidence: HIGH
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Fact-check summary

Microsoft's disclosure of CVE-2026-83947 (Azure Event Grid spoofing flaw, CVSS 7.7) is corroborated by MSRC October 2026 updates and CVE databases.

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Home/Tech/Microsoft discloses CVE-2026-83947 in Azure Event Grid
VERIFIEDBy Xavier Rivera· ·1 min read

Microsoft discloses CVE-2026-83947 in Azure Event Grid

Microsoft has disclosed CVE-2026-83947, a CVSS 7.7 HIGH spoofing vulnerability in Azure Event Grid caused by missing authorization. Microsoft says it has already fully mitigated the cloud-service flaw and customers have nothing to do.

Source:NVD
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Microsoft discloses CVE-2026-83947 in Azure Event Grid
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TL;DRAI · 60 sec read

Microsoft discloses CVE-2026-83947 in Azure Event Grid. The high-severity issue stems from missing authorization and could let an already-authorized attacker perform spoofing over a network, at low complexity and with no user interaction. It carries a 7.7 CVSS score, with a high integrity impact and no confidentiality or availability impact. Microsoft says it has already fully mitigated the flaw and customers need to take no action.

⚐ CORRECTED 

Wrong: said the flaw affects confidentiality, integrity and availability, and told Azure customers to check the advisory for patches or configuration changes. Right: the CVSS vector lists a high integrity impact only, with no confidentiality or availability impact, and Microsoft says it has already fully mitigated the flaw, so customers need to take no action.

→ All corrections
Microsoft has disclosed CVE-2026-83947, a high-severity vulnerability in Azure Event Grid.
The flaw stems from missing authorization controls.
The flaw stems from missing authorization controls. An attacker who already holds authorization could exploit the issue to perform spoofing over a network. The vulnerability carries a CVSS score of 7.7 and falls into the HIGH severity category.
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The attack requires low complexity and no user interaction. The CVSS vector rates the integrity impact high, with a changed scope that crosses trust boundaries, and lists no confidentiality or availability impact.
Impact is limited to spoofing.
Impact is limited to spoofing. An attacker who already holds authorization could misuse the missing checks to impersonate other entities. The record lists no data disclosure or service disruption.
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No customer action is required. Microsoft's Security Update Guide says the vulnerability has already been fully mitigated by Microsoft and there is no action for users of the service to take. Microsoft says it publishes cloud-service CVEs like this one for transparency, and it lists this flaw as not publicly disclosed and not exploited.

EXPERT TAKE

Microsoft says Event Grid customers have nothing to patch: the fix is already in place on Microsoft's side.

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