CVE-2026-58630: Azure App Service on Azure Stack Hub Elevation of Privilege Vulnerability

criticalCVSS 10CVE-2026-58630

Improper access control in Azure App Service allows an unauthorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoft product: Azure App Service Privilege escalation

What: Improper access control allows an unauthorized attacker to elevate privileges over a network.
Who is affected: Deployments of Azure App Service on Azure Stack Hub.
Urgency: Remediation is urgent due to the critical severity and potential for exploitation.
Action: Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 10
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58630

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-586300.81% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-58630	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Azure App Service

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-58630: Improper access control in Azure App Service allows an unauthorized attacker to elevate privil…nvd · 2026-07-24