Remote Code Execution Vulnerability in Azure App Service by Microsoft
CVE-2026-77900

9.8CRITICAL

Key Information:

Vendor

Microsoft
Status
Azure App Service For Linux
Vendor
CVE Published:
8 October 2026

What is CVE-2026-77900?

A security flaw in Azure App Service allows unauthorized attackers to execute arbitrary code remotely due to insufficient authentication for a critical function. This vulnerability opens the door for potential malicious activity and compromises the integrity of applications hosted on the service. Users are urged to implement recommended security patches to safeguard their environments.

Affected Version(s)

Azure App Service for Linux -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.