Affects Microsoft Azure Service Bus, a widely used cloud messaging platform; network RCE can disrupt enterprise services across industries.
CVE-2026-50515
Authenticated RCE via deserialization in Azure Service Bus
Is CVE-2026-50515 being exploited?
Not confirmed. CVE-2026-50515 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-50515?
CVE-2026-50515 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-50515?
Yes. A fix has been recorded for CVE-2026-50515. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-50515 affect?
CVE-2026-50515 affects Microsoft Azure Service Bus, Azure messaging services. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-50515?
Restrict Service Bus access, monitor logs, rotate credentials, apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated remote code execution via deserialization in Azure Service Bus; attacker can run arbitrary code, move laterally, disrupt messaging, and exfiltrate data.
Immediate action required