Patch tracker / CVE reference / CVE-2026-97739
CVE-2026-97739
CVE-2026-97739 is a Microsoft vulnerability that Microsoft rates Critical, with a CVSS score of 8.8 (High). Microsoft has shipped the fix: deploy the update below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
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Microsoft rates it Critical. CVSS 8.8 (High). Fixed by 1 Microsoft security update.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 8.8 (High).
This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.
This is an Excel remote code execution flaw with a High severity score (CVSS 8.8), and it covers both 32-bit and 64-bit Office LTSC 2021 plus 64-bit Office LTSC 2024, so it reaches the perpetual-license builds that many organizations keep outside the Microsoft 365 update channel. Exploitation probability is low at 1% and CISA has not listed it as exploited, with no known ransomware use, so this is a patch-on-schedule item rather than an emergency. The risk to weigh is that LTSC installs often lag on updates, which leaves a long window for a malicious spreadsheet to run code as the user.
Do this: Inventory your Office LTSC 2021 and LTSC 2024 installs and deploy the Microsoft update for CVE-2026-97739 on your normal priority patch cycle, starting with machines that open spreadsheets from external senders.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-97739
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-97739
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing update KB5002928 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security update below to fix CVE-2026-97739. 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
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Office 365 for Mac
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft Office LTSC for Mac 2021
- Microsoft Office LTSC for Mac 2024
- Office Online Server
- Fixed by the same update
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.