Patch tracker / CVE reference / CVE-2026-33841

CVE-2026-33841

CVE-2026-33841 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.8 (High). Microsoft has shipped the fix: deploy one of the 12 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 v3

2.3%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 2.3%. CVSS 7.8 (High).

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

Senserva AI Opinion for CVE-2026-33841

This Windows kernel escalation covers Windows Server 2022 including Server Core plus Windows 10 21H2, rated Critical (CVSS 9.8) with a 72 percent EPSS exploit probability. It extends this cycle's kernel findings beyond the 1809 branch, so organizations that migrated off legacy builds still have exposed hosts. Kernel bugs at this probability level are the ones that show up in incident reports months later on whatever remained unpatched.

Do this: Sweep Server 2022 and 21H2 machines for the update now, treating them with the same urgency as the older branches.

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

Senserva AI Opinion and rich prompt for CVE-2026-33841

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-2026-33841 (source: https://senserva.com/cve/CVE-2026-33841.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- CVE-2026-33841: Microsoft vulnerability, Microsoft rating Important, CVSS 7.8 (High)
- EPSS 30-day exploitation probability: 2.3%
- Actively exploited (CISA KEV): no
- Fixed by: KB5087420, KB5087423, KB5087424, KB5087539, KB5087541, KB5087544, KB5087545, KB5089466, KB5089548, KB5089549, KB5093998, KB5094127
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 2%.

Fixed by KB5087420 and 11 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-2026-33841

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5087420, KB5087423, KB5087424, KB5087539, KB5087541, KB5087544, KB5087545, KB5089466, KB5089548, KB5089549, KB5093998, KB5094127 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-2026-33841. 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.

KB5087420 KB5087423 KB5087424 KB5087539 KB5087541 KB5087544 KB5087545 KB5089466 KB5089548 KB5089549 KB5093998 KB5094127

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-54518 CVE-2026-41089 CVE-2026-41096 CVE-2026-44815 CVE-2026-45657 CVE-2026-47291 CVE-2026-42904 CVE-2025-10263

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.