Microsoft Azure Cosmos DB vulnerabilities

4 CVEs affecting Microsoft Azure Cosmos DB, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-87701, published 2026-09-17.

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

• CVE-2026-66803, published 2026-07-30. Critical severity, CVSS 10.0. EPSS: 0.9% chance of exploitation in the next 30 days. Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.
• CVE-2026-87701, published 2026-09-17. Critical severity, CVSS 9.6. EPSS: 0.8% chance of exploitation in the next 30 days. Improper neutralization of special elements in output used by a downstream component ('injection') in Azure Cosmos DB allows an authorized attacker to elevate privileges over a network.
• CVE-2025-64675, published 2025-12-19. Critical severity, CVSS 9.6. EPSS: 0.7% chance of exploitation in the next 30 days. Improper neutralization of input during web page generation ('cross-site scripting') in Azure Cosmos DB allows an unauthorized attacker to perform spoofing over a network.
• CVE-2026-69857, published 2026-09-03. High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days. Authorization bypass through user-controlled key in Azure Cosmos DB allows an authorized attacker to perform spoofing over a network.