Patch tracker / CVE reference / CVE-2026-45484
CVE-2026-45484
CVE-2026-45484 is a high severity Microsoft vulnerability with a CVSS score of 8.8. Its EPSS score puts the probability of exploitation in the next 30 days at 35%. Microsoft has shipped the fix: deploy one of the 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 8.8 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
CVE-2026-45484 is an elevation of privilege flaw in on-premises SharePoint spanning Enterprise Server 2016, Server 2019, and Subscription Edition, rated High at CVSS 8.8. That score is unusually high for an EoP class bug, which points to low attack complexity and likely authenticated access that lets a low-privilege user gain broader control over the farm. It is not in CISA KEV and has no known ransomware use yet, but SharePoint servers are internet-adjacent and high-value, so exposure hinges on how many farms you still run on-prem.
Do this: Inventory all on-premises SharePoint 2016, 2019, and Subscription Edition farms and apply the vendor patch for CVE-2026-45484 this cycle.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-45484
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-45484
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-2026-45484. 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.