major vulnerability· requires attention

Microsoft Azure Arc is widely deployed; a CVSS 10.0 privilege escalation enabling host takeover is highly impactful enterprise-wide.

Cloud

CVE-2026-69399

10.0

Critical

EPSS 0.59%Patch available

Azure Arc privilege escalation enabling host admin takeover.

exploited

No known exploitation not in CISA KEV as of our last sync

fix

Patch available see the advisory in the references

likelihood

EPSS 0.59%top 52% of scored CVEs

Published 17 Sept 2026Analysed here 19 Sept 2026

common questions

Is CVE-2026-69399 being exploited?

Not confirmed. CVE-2026-69399 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 0.59% probability of exploitation in the next 30 days.

How severe is CVE-2026-69399?

CVE-2026-69399 is rated Critical with a CVSS score of 10.0. 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-2026-69399?

Yes. A fix has been recorded for CVE-2026-69399. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-69399 affect?

CVE-2026-69399 affects Microsoft Azure Arc, Azure Arc-enabled servers, Azure Arc agents (Windows/Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-69399?

Install MS update for CVE-2026-69399 immediately; isolate/restrict Arc-managed hosts.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

Microsoft Azure ArcAzure Arc-enabled serversAzure Arc agents (Windows/Linux)

impact

Privilege escalation in Azure Arc agents allowing attackers to gain administrative/system control on managed hosts.

action required

Immediate action required

cisa ssvc

exploitation: none
automatable: yes
technical impact: total

Assessed by CISA 18 Sept 2026 (SSVC 2.0.3).

timeline

17 Sept 2026Published
18 Sept 2026CISA SSVC assessment: exploitation none · 1 day later
19 Sept 2026Analysed by vulneraibility.com · 1 day later
31 Oct 2026CVE record last updated · 42 days later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

1 reference in the CVE record: 1 patch

Patchmsrc.microsoft.com /update-guide/vulnerability/CVE-2026-69399

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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