Patch tracker / CVE reference / CVE-2025-59248

CVE-2025-59248

CVE-2025-59248 is a high severity Microsoft vulnerability with a CVSS score of 7.5. Microsoft has shipped the fix: deploy one of the 4 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.5

CVSS v3

<1%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 7.5 (High).

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

Senserva AI Opinion for CVE-2025-59248

A spoofing flaw in Microsoft Exchange Server, rated High Severity at CVSS 8.8, covering Subscription Edition RTM, 2019 CU15, and 2016 CU23. Spoofing at the mail server layer is a phishing force multiplier: messages can carry trust signals they have not earned, and users have little chance of spotting the difference. Exploit probability is just 1 percent, but Exchange flaws draw disproportionate attacker attention regardless of the initial numbers.

Do this: Apply the Exchange security update across all your on-premises servers and Subscription Edition installs in one coordinated pass.

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

Senserva AI Opinion and rich prompt for CVE-2025-59248

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-2025-59248 (source: https://senserva.com/cve/CVE-2025-59248.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-59248: High severity Microsoft vulnerability, CVSS 7.5
- EPSS 30-day exploitation probability: <1%
- Actively exploited (CISA KEV): no
- Fixed by: KB5066366, KB5066367, KB5066368, KB5066369
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: not in the CISA KEV catalog, EPSS under 1%.

Fixed by KB5066366 and 3 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-2025-59248

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5066366, KB5066367, KB5066368, KB5066369 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-2025-59248. 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.

KB5066366 KB5066367 KB5066368 KB5066369

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-59249 CVE-2025-53782

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.