Patch tracker / CVE reference / CVE-2026-45659
CVE-2026-45659
Updated July 21, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
High severity Microsoft vulnerability, CVSS 8.8. Fixed by 3 Microsoft security updates.
All about CVE-2026-45659: the Senserva AI read, whether it is exploited, the official patches, what the press says about it, its change history, and the questions admins ask.
CVE-2026-45659 is a high severity Microsoft vulnerability with a CVSS score of 8.8. It is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it in the wild, which makes it a fix-first item. 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
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Senserva AI Opinion for CVE-2026-45659
CVE-2026-45659 is a SharePoint remote code execution flaw that CISA confirmed as actively exploited and added to its Known Exploited Vulnerabilities catalog on 2026-07-01, despite a modest 3 percent EPSS score. Any organization running SharePoint Enterprise Server 2016, Server 2019, or the Subscription Edition is exposed, and on premises SharePoint is often internet reachable and holds sensitive documents. The KEV listing means attacks are already happening in the wild, so the low EPSS number should not lower your urgency.
Do this: Identify all SharePoint 2016, 2019, and Subscription Edition instances and apply the Microsoft patch for CVE-2026-45659 today, prioritizing any externally accessible servers.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-45659
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-45659
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.
What the press says about CVE-2026-45659
Trusted-source coverage, pulled live from their own feeds.
Exploitation and severity
Listed in the CISA Known Exploited Vulnerabilities catalog, confirmed exploited in the wild. EPSS exploit probability 3.2%. CVSS 8.8 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability, and one of 1 actively-exploited CVEs in May 2026.
Official patch(es) for CVE-2026-45659
Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. In Intune or Defender, confirm whether the fixing updates KB5002863, KB5002868, KB5002870 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-2026-45659. 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-2026-45659
Is CVE-2026-45659 actively exploited?
Yes. CVE-2026-45659 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed. Its EPSS exploit probability is 3.2%.
What patch fixes CVE-2026-45659?
Microsoft fixed CVE-2026-45659 in KB5002863, KB5002868, KB5002870. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-45659?
Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
Can I ask my own AI about CVE-2026-45659?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-45659'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 three times a day (5 AM, 12:30 PM, and 7 PM US Central).
Fixed by the same updates
If you are patching CVE-2026-45659, 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.
