Patch tracker / CVE reference / CVE-2026-45454
CVE-2026-45454
CVE-2026-45454 is a medium severity Microsoft vulnerability with a CVSS score of 6.5. Its EPSS score puts the probability of exploitation in the next 30 days at 35%. 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
Not in the CISA KEV catalog. EPSS exploit probability 35%. CVSS 6.5 (Medium).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
CVE-2026-45454 is a remote code execution flaw in on-premises SharePoint, spanning Enterprise Server 2016, Server 2019, and the Subscription Edition, so any organization still running SharePoint in its own datacenter is exposed. Its Severity is Medium with a CVSS score of 6.5, which is lower than typical SharePoint RCE ratings, and it is not in the CISA KEV catalog nor linked to ransomware. That lower score likely reflects an authentication or access precondition rather than unauthenticated network exploitation.
Do this: Inventory your on-premises SharePoint 2016, 2019, and Subscription Edition farms and schedule the Microsoft patch for CVE-2026-45454 in your next maintenance window.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-45454
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-45454
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, KB5002880 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-2026-45454. 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.