Patch tracker / CVE reference / CVE-2026-40357

CVE-2026-40357

CVE-2026-40357 is a high severity Microsoft vulnerability with a CVSS score of 8.8. Microsoft has shipped the fix: deploy one of the 3 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
8.8
CVSS
9.1%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 9.1%. CVSS 8.8 (High).

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

Senserva AI Opinion for CVE-2026-40357

This High Severity (CVSS 8.8) Remote Code Execution flaw continues the streak against on-premises SharePoint 2016, 2019, and Subscription Edition. The steady drumbeat of SharePoint RCEs is itself the signal: the product is under sustained offensive research, and on-prem customers do not benefit from the continuous patching SharePoint Online receives. Each unpatched month widens the gap between your farm and the threat landscape.

Do this: Patch the farms now, and start scoping what a migration to SharePoint Online would take for the content that keeps these servers running.

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

Senserva AI Opinion and rich prompt for CVE-2026-40357

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Schedule normally
No exploitation observed: not in the CISA KEV catalog, EPSS 9%.
Fixed by KB5002863 and 2 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-2026-40357

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5002863, KB5002868, KB5002870 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-2026-40357. 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.

KB5002863KB5002868KB5002870

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-45659CVE-2026-33110CVE-2026-33112CVE-2026-35439CVE-2026-40365CVE-2026-40367CVE-2026-40368CVE-2026-47294
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.