Patch tracker / CVE reference / CVE-2026-44817

CVE-2026-44817

CVE-2026-44817 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Microsoft has shipped the fix: deploy one of the 2 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.8

CVSS

<1%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 7.8 (High).

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

Senserva AI Opinion for CVE-2026-44817

This is an Excel remote code execution flaw with an unusual spread across platforms: Office 365 for Mac, Office Online Server, and Office 2019 32-bit, so both desktop and server side rendering of spreadsheets are in scope. Severity is High with a CVSS score of 8.2, but EPSS exploit probability sits at 1% and there is no CISA KEV listing or known ransomware use. The Office Online Server exposure matters most since it processes documents server side, potentially without a user opening a file locally.

Do this: Patch Office Online Server first given its server side document processing, then push Office 365 for Mac and Office 2019 32-bit updates to endpoints.

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

Senserva AI Opinion and rich prompt for CVE-2026-44817

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-2026-44817 (source: https://senserva.com/cve/CVE-2026-44817.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-44817: High severity Microsoft vulnerability, CVSS 7.8
- EPSS 30-day exploitation probability: <1%
- Actively exploited (CISA KEV): no
- Fixed by: KB5002875, KB5002877
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 KB5002875 and 1 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-2026-44817

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5002875, KB5002877 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-2026-44817. 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.

KB5002875 KB5002877

Scope and sources

Affected products

Fixed by the same updates

CVE-2026-44822 CVE-2026-45455 CVE-2026-44820 CVE-2026-44823 CVE-2026-45469 CVE-2026-44818

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.