Vulnerability in Microsoft Azure App Service for Linux

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.8

[ Description ]Official description

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

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3834

  Microsoft Azure: Multiple vulnerabilities Translated from German

  CVE-2026-77900CVE-2026-83943CVE-2026-69435+1 more CVEs

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77900