Patch tracker / CVE reference / CVE-2026-27907

CVE-2026-27907

CVE-2026-27907 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 56%. Microsoft has shipped the fix: deploy one of the 5 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

Critical

9.8

CVSS

56%

EPSS, 30 days

Critical

Severity

Not in the CISA KEV catalog. EPSS exploit probability 56%. CVSS 9.8 (Critical).

This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-27907

CVE-2026-27907 is a Storage Spaces Controller privilege escalation flaw carrying an unusually high Critical CVSS of 9.8 for an elevation of privilege bug, alongside a 64 percent EPSS exploit probability. Exposure spans Windows Server 2025 Server Core plus Windows 11 25H2 on both ARM64 and x64, meaning both headless server hosts and end-user workstations are in scope. It is not in CISA KEV and has no known ransomware use yet, but the high exploit probability means proof-of-concept activity is plausible before that changes.

Do this: Deploy the Microsoft patch for CVE-2026-27907 to your Windows Server 2025 Server Core hosts and Windows 11 25H2 ARM64 and x64 systems this cycle, prioritizing multi-user and internet-adjacent machines first.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-27907

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin assessing a vulnerability. Facts for CVE-2026-27907 (source: https://senserva.com/cve/CVE-2026-27907.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-27907: Critical severity Microsoft vulnerability, CVSS 9.8
- EPSS 30-day exploitation probability: 56%
- Actively exploited (CISA KEV): no
- Fixed by: KB5082052, KB5082060, KB5082063, KB5083768, KB5083769
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 56%).

Fixed by KB5082052 and 4 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2026-27907

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5082052, KB5082060, KB5082063, KB5083768, KB5083769 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2026-27907. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5082052 KB5082060 KB5082063 KB5083768 KB5083769

Scope and sources

Affected products

Fixed by the same updates

CVE-2023-20585 CVE-2025-64720 CVE-2025-65018 CVE-2026-20806 CVE-2026-20928 CVE-2026-20930 CVE-2026-23670 CVE-2026-25184

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.