Patch tracker / CVE reference / CVE-2026-45471
CVE-2026-45471
CVE-2026-45471 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 35%. Microsoft has shipped the fix: deploy one of the 6 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability 35%. CVSS 9.8 (Critical).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
CVE-2026-45471 is a remote code execution flaw in Microsoft Word that spans an unusual mix of platforms: Office 365 for Mac plus SharePoint Enterprise Server 2016 and SharePoint Server 2019, meaning the Word parsing component is exposed both on desktop Macs and on server-side document handling. Severity is High at CVSS 8.4, but EPSS exploit probability is 0 percent, it is not in CISA KEV, and there is no known ransomware use. Right now this is a patch-on-schedule item rather than an emergency, though the SharePoint server exposure raises the stakes since a malicious document processed server-side is harder to contain than a single user opening a file.
Do this: Deploy the Microsoft update to your SharePoint Server 2016 and 2019 farms first, then push the Office 365 for Mac fix 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-2026-45471
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-45471
Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5002873, KB5002874, KB5002876, KB5002879, KB5002880, KB5002881 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-2026-45471. 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.
Scope and sources
- Affected products
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.