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Microsoft's Security Update Guide confirms CVE-2026-77900, a critical 9.8 CVSS RCE in Azure App Service for Linux due to missing authentication.

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Home/Tech/Critical CVE-2026-77900 Hits Microsoft Azure App Service for Linux
VERIFIEDBy Xavier Rivera· ·1 min read

Critical CVE-2026-77900 Hits Microsoft Azure App Service for Linux

A critical vulnerability CVE-2026-77900 affects Microsoft Azure App Service for Linux with a CVSS score of 9.8. The flaw allows an unauthenticated attacker to execute code over the network. Microsoft says it has already fully mitigated the flaw; no customer action is needed.

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Critical CVE-2026-77900 Hits Microsoft Azure App Service for Linux
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TL;DRAI · 60 sec read

Microsoft Azure App Service for Linux contains critical vulnerability CVE-2026-77900. The issue carries a CVSS score of 9.8 and the National Vulnerability Database rates it critical. It stems from missing authentication for a critical function. An unauthorized attacker can execute code over a network without privileges or user interaction. Microsoft says it has already fully mitigated the flaw; no customer action is needed.

Microsoft Azure App Service for Linux contains a critical vulnerability tracked as CVE-2026-77900.
An unauthorized attacker can execute code over a network.
The flaw carries a CVSS score of 9.8. The National Vulnerability Database rates the issue critical. It stems from missing authentication for a critical function.

An unauthorized attacker can execute code over a network. The vulnerability requires no privileges or user interaction. Attackers can reach the affected service directly across the network.
Microsoft says it has already fully mitigated the flaw; no customer action is needed.
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Microsoft says no customer action is needed. Microsoft says it has already fully mitigated the flaw; no customer action is needed. Its Security Update Guide entry says Microsoft published the CVE for transparency, and it lists the flaw as not publicly disclosed and not exploited. The record was published on October 8, 2026.
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