Patch tracker / CVE reference / CVE-2026-55043
CVE-2026-55043
CVE-2026-55043 is a high severity Microsoft vulnerability with a CVSS score of 7.8. 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.
High severity Microsoft vulnerability, CVSS 7.8. Fixed by 1 Microsoft security update.
Risk summary
Updated July 25, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-55043
This is a PowerPoint remote code execution flaw rated High with a CVSS score of 7.8, triggered when a user opens a crafted presentation. It reaches across platforms, hitting Office 365 for Mac alongside both 32-bit and 64-bit Office 2019 on Windows, so mixed fleets are all in scope. It is not in the CISA KEV catalog and has no known ransomware use, but the file-open attack path makes it a natural phishing lure.
Do this: Deploy the Microsoft Office update for both your Mac Office 365 and Windows Office 2019 installations, prioritizing endpoints that open externally sourced presentations.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-55043
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-55043
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 <1%. CVSS 7.8 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-55043
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing update KB5002867 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-2026-55043. 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-2026-55043
Is CVE-2026-55043 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 <1%.
What patch fixes CVE-2026-55043?
Microsoft fixed CVE-2026-55043 in KB5002867. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-55043?
Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac.
Can I ask my own AI about CVE-2026-55043?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-55043'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 update
If you are patching CVE-2026-55043, the same update also fixes these:
Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.
