Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Microsoft Azure App Service for Linux affected
Version Status Constraints
- affected —

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Project Subscriptions

Vendors Products
Microsoft Subscribe
Azure App Service Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77900 cve-icon
History

Thu, 08 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Description Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
Title Azure App Service Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft azure App Service
Weaknesses CWE-306
CPEs cpe:2.3:a:microsoft:azure_app_service:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft azure App Service
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-08T22:15:30.299Z

Reserved: 2026-08-21T17:26:55.612Z

Link: CVE-2026-77900

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses