Patch tracker / CVE reference / CVE-2025-59260

CVE-2025-59260

CVE-2025-59260 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 5.5 (Medium). 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

Medium

5.5

CVSS v3

6.4%

EPSS, 30 days

Medium

Severity

Not in the CISA KEV catalog. EPSS exploit probability 6.4%. CVSS 5.5 (Medium).

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

Senserva AI Opinion for CVE-2025-59260

This is the third clustering-related fix in this release, targeting the Failover Cluster Virtual Driver on Windows Server 2019, its Core build, and Windows Server 2022 at Critical 9.9 with 6 percent EPSS. Alongside CVE-2025-47979 and CVE-2025-59188, this brings the cycle's cluster-related fix count to three, all pointing to clustering as the area needing the most attention on these server versions right now. All three should land in the same cumulative update.

Do this: Roll all three of this cycle's cluster-related fixes into a single patch pass on Server 2019 and Server 2022 clustered nodes.

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

Senserva AI Opinion and rich prompt for CVE-2025-59260

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-2025-59260 (source: https://senserva.com/cve/CVE-2025-59260.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- CVE-2025-59260: Microsoft vulnerability, Microsoft rating Important, CVSS 5.5 (Medium)
- EPSS 30-day exploitation probability: 6.4%
- Actively exploited (CISA KEV): no
- Fixed by: KB5066586, KB5066780, KB5066782, KB5066835, KB5066836
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.

Schedule normally

No exploitation observed as of 2026-10-14: not in the CISA KEV catalog, EPSS 6%.

Fixed by KB5066586 and 4 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Official patch(es) for CVE-2025-59260

Lower priority: patch in your normal cycle. In Intune or Defender, confirm whether the fixing updates KB5066586, KB5066780, KB5066782, KB5066835, KB5066836 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-2025-59260. 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.

KB5066586 KB5066780 KB5066782 KB5066835 KB5066836

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-24990 CVE-2025-59230 CVE-2025-47827 CVE-2025-49708 CVE-2025-58715 CVE-2025-58716 CVE-2025-58718 CVE-2025-59295

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.