CVE-2026-77900 Azure App Service Remote Code Execution Vulnerability

{
  "id": "517782f11d510e39e789f5a35c4a217af0ab0cb79238cc1a004c8fd0da6158c8",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77900",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-77900 Azure App Service Remote Code Execution Vulnerability",
    "summary": "A missing authentication check in Azure App Service could allow an unauthorized attacker to execute code over a network.",
    "evidence": "Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.",
    "products": [
      {
        "name": {
          "value": "Azure App Service",
          "evidence": "CVE-2026-77900 Azure App Service Remote Code Execution Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-77900",
        "evidence": "CVE-2026-77900 Azure App Service Remote Code Execution Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25963,
  "published_at": "2026-10-08T14:00:00+00:00"
}