CVE-2026-77900

Missing authentication for critical function in Azure App Service allows an unauthorized attacker…

Risk score: 82/100
CVSS: 9.8 v3.1
Exploit chance (30 days): 0.5%
Published: 8 Oct 2026

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What to know

What it is: Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
Affected: See advisory
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Red

CVSS 9.8 critical
Remotely exploitable without logging in
On your watchlist: azure

References

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

Original description

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

Last activity 8 Oct 2026. Patch Forecast updates every hour.