Vulnerability · Published Oct 8, 2026 · Assigned by microsoft
CVE-2026-77900Azure App Service Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity missing authentication in Azure App Service for Linux from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 45.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Azure App Service for Linux | - |
Weakness: CWE-306 · 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
References
- Azure App Service Remote Code Execution Vulnerability vendor-advisory, patch