Targets Microsoft Azure Attestation services used broadly in cloud environments; RCE in these trust services can impact many tenants and cloud trust/integrity.
CVE-2026-66802
Race-condition RCE in Microsoft Azure Attestation and Device Health Attestation services.
Is CVE-2026-66802 being exploited?
Not confirmed. CVE-2026-66802 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 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-66802?
CVE-2026-66802 is rated High with a CVSS score of 8.1. 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-2026-66802?
Yes. A fix has been recorded for CVE-2026-66802. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66802 affect?
CVE-2026-66802 affects Microsoft Azure Attestation service, Device Health Attestation Service. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66802?
Apply vendor patch/mitigations immediately; restrict access to attestation endpoints; monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via race condition; attacker can run arbitrary code, corrupt attestation/health data and pivot in cloud tenants.
Immediate action required
- affected>= 10.0.17763.0 and < 10.0.17763.9121
- affected>= 10.0.28000.0 and < 10.0.28000.2704
- affected>= 10.0.17763.0 and < 10.0.17763.9121
- affected>= 10.0.17763.0 and < 10.0.17763.9121
- affected>= 10.0.20348.0 and < 10.0.20348.5499
- affected>= 10.0.26100.0 and < 10.0.26100.33296
- affected>= 10.0.26100.0 and < 10.0.26100.33296
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.