CVE-2026-50515: Azure Service Bus Remote Code Execution Vulnerability

criticalCVSS 9.9CVE-2026-50515

Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoft product: Azure Service Bus Unsafe deserialization Remote code execution

What: Deserialization of untrusted data allows remote code execution by authorized attackers.
Who is affected: Azure Service Bus deployments accessible to authorized attackers are affected.
Urgency: Critical severity (CVSS 9.9) with no current exploitation reported; immediate patching essential.
Action: Update Azure Service Bus to patched version and restrict access to trusted sources.

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 9.9
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50515

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50515	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 Service Bus

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-2026-50515: Deserialization of untrusted data in Azure Service Bus allows an authorized attacker to execut…nvd · 2026-08-07