Microsoft Azure Event Grid vulnerabilities

2 CVEs affecting Microsoft Azure Event Grid, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-83947, published 2026-10-08.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2025-59273, published 2025-10-23. Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days. Improper access control in Azure Event Grid allows an unauthorized attacker to elevate privileges over a network.
• CVE-2026-83947, published 2026-10-08. Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days. Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network.