What’s Vulnerable › Vulnerabilities

CVE-2020-16904: Azure Functions Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-16 · updated 2026-06-17
• Weakness: CWE-863

Description

<p>An elevation of privilege vulnerability exists in the way Azure Functions validate access keys.</p> <p>An unauthenticated attacker who successfully exploited this vulnerability could invoke an HTTP Function without proper authorization.</p> <p>This security update addresses the vulnerability by correctly validating access keys used to access HTTP Functions.</p>

Affected products

• Microsoft Azure Functions: all versions
• Microsoft Azure Functions: all versions

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16904
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16904

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