Patch tracker / CVE reference / CVE-2026-55127
CVE-2026-55127
CVE-2026-55127 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 57%. 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.
Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 6 Microsoft security updates.
Risk summary
Updated July 25, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-55127
This is a Critical (CVSS 9.8) remote code execution flaw in Microsoft Word that spans both SharePoint Server 2019 and Microsoft 365 Apps for Enterprise on 32-bit and 64-bit systems, meaning it touches both server-side document handling and desktop Office installs. The 21% EPSS score is elevated for something not yet in CISA KEV, and the 9.8 rating suggests attacker interaction requirements are minimal. It matters now because a document-parsing RCE across these products is a broad attack surface reachable through emailed or SharePoint-hosted files.
Do this: Deploy Microsoft's patch to your SharePoint Server 2019 hosts and all Microsoft 365 Apps for Enterprise installs, starting with internet-facing SharePoint and users who handle external documents.
AI-generated from public data, 2026-07-24. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-55127
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-55127
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
Exploitation and severity
Not in the CISA KEV catalog. EPSS exploit probability 57%. CVSS 9.8 (Critical).
This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-55127
High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5002882, KB5002883, KB5002885, KB5002890, KB5002891, KB5002892 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-2026-55127. 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.
Affected products
Common questions about CVE-2026-55127
Is CVE-2026-55127 actively exploited?
It is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score puts the probability of exploitation in the next 30 days at 57%.
What patch fixes CVE-2026-55127?
Microsoft fixed CVE-2026-55127 in KB5002882, KB5002883, KB5002885, KB5002890, KB5002891, KB5002892. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-55127?
Microsoft Office 2019 for 32-bit editions, Microsoft Office 365 for Mac, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
Can I ask my own AI about CVE-2026-55127?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-55127's key facts: severity, CVSS, EPSS exploit probability, CISA KEV status, and the fixing KB. Copy it into Claude, ChatGPT, or Copilot for a triage plan; the data is refreshed twice a day (5 AM and 3 PM US Central).
Fixed by the same updates
If you are patching CVE-2026-55127, the same updates also fix these:
Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.
