Patch tracker / CVE reference / CVE-2026-70197

CVE-2026-70197

CVE-2026-70197 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 8.1 (High). Microsoft’s guidance on this CVE disagrees with itself. Its Security Update Guide entry still carries the October 19, 2026 revision: “Microsoft is aware that the vulnerability for which this CVE was assigned has not been addressed. We are working to prepare and test a complete mitigation. We will update this document when there is more information.” Microsoft’s .NET release notes list the complete fix in .NET 8.0.33, .NET 9.0.22, .NET 10.0.14, .NET 11.0.0-rc.3 (October 25, 2026). Install one of those releases; the earlier updates listed below may not fully fix it.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Validation warning

Microsoft’s own pages disagree about this CVE’s fix. Our automatic cross-check found both; each is linked below with its date.

Out of date: Microsoft’s Security Update Guide still carries its revision of October 19, 2026: “Microsoft is aware that the vulnerability for which this CVE was assigned has not been addressed. We are working to prepare and test a complete mitigation. We will update this document when there is more information.” Its latest revision, on October 25, 2026, does not change that: “Updated product information in the Software Update table. This is an informational change only.”
Current: Microsoft’s .NET release notes list the fix in .NET 8.0.33 (October 25, 2026), .NET 9.0.22 (October 25, 2026), .NET 10.0.14 (October 25, 2026), .NET 11.0.0-rc.3 (October 25, 2026).
Senserva checked both on November 3, 2026.

Microsoft rates it Important. CVSS 8.1 (High). Fixed by 6 Microsoft security updates.

Official patches for CVE-2026-70197 Change history Admin questions

Risk summary

High

8.1

CVSS v3

<1%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 8.1 (High).

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

Schedule normally

No exploitation observed as of 2026-11-03: not in the CISA KEV catalog, EPSS under 1%.

Fixed by KB5133964 and 5 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.

Senserva AI Opinion and rich prompt for CVE-2026-70197

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-2026-70197 (source: https://senserva.com/cve/CVE-2026-70197.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- CVE-2026-70197: Microsoft vulnerability, Microsoft rating Important, CVSS 8.1 (High)
- EPSS 30-day exploitation probability: <1%
- Actively exploited (CISA KEV): no
- Fixed by: KB5130034, KB5130035, KB5130036, KB5133964, KB5133965, KB5133966
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.

Official patch(es) for CVE-2026-70197

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5130034, KB5130035, KB5130036, KB5133964, KB5133965, KB5133966 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-2026-70197. 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.

KB5130034 KB5130035 KB5130036 KB5133964 KB5133965 KB5133966

Scope and sources

Affected products

Fixed by the same updates

CVE-2026-111497 CVE-2026-105016 CVE-2026-88092 CVE-2026-70188 CVE-2026-102870 CVE-2026-70007 CVE-2026-70035 CVE-2026-70174

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.