← Vulnerability feed

Vulnerability record · CVE-2020-16904 · published 16 October 2020

CVE-2020-16904: Microsoft azure functions incorrect authorization vulnerability

Microsoft · Azure Functions

<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>

5.3 CVSS 3.1 Medium EPSS 3.4% · top 11.7% CWE-863 · Incorrect authorization
5.3CVSS 3.1 base score, v2 7.5
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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>

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2020-16904 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-49052Microsoft azure functions missing authentication for critical function vulnerabilityMissing authentication for critical function in Microsoft Azure PolicyWatch allows an unauthorized attacker to elevate privileges over a network.EPSS 0.70%8.8CVE-2025-33074Microsoft azure functions improper verification of cryptographic signature vulnerabilityImproper verification of cryptographic signature in Microsoft Azure Functions allows an authorized attacker to execute code over a network.EPSS 0.59%8.2CVE-2026-21532Microsoft azure functions information exposure vulnerabilityAzure Function Information Disclosure VulnerabilityEPSS 0.89%6.5CVE-2024-38204Microsoft azure functions improper access control vulnerabilityImproper access control in Imagine Cup allows an authorized attacker to elevate privileges over a network.EPSS 0.94%9.1CVE-2026-71362Adobe commerce incorrect authorization vulnerabilityAdobe Commerce is affected by an Incorrect Authorization vulnerability that could result in privilege escalation. An attacker could leverage this vul…KEVEPSS 88%8.8CVE-2026-42016JFrog Artifactory token scope bypass enables privilege escalationJFrog Artifactory (Self Hosted) before 7.133.11 validates a token's signature and issuer but not its scope, so a token can be used for actions beyond…KEVEPSS 8.6%analysed10.0CVE-2025-54253Adobe Experience Manager Forms misconfiguration allows pre-auth code executionAdobe Experience Manager Forms 6.5.23 and earlier contain a misconfiguration (CWE-863, incorrect authorization) that lets an attacker bypass security…KEVEPSS 88%analysed5.4CVE-2025-55177WhatsApp iOS and Mac linked-device sync authorization flawWhatsApp for iOS, WhatsApp Business for iOS and WhatsApp for Mac fail to fully authorize linked-device synchronization messages, letting an unrelated…KEVEPSS 4.3%analysed

Source: NIST National Vulnerability Database (record CVE-2020-16904), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.