Patch tracker / CVE reference / CVE-2026-45483
CVE-2026-45483
CVE-2026-45483 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. 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.
Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 3 Microsoft security updates.
Risk summary
Updated July 23, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-45483
Despite the Office Project Server title, this spoofing flaw actually affects on-premises SharePoint: Subscription Edition, Enterprise Server 2016, and Server 2019. At Severity Medium with a CVSS score of 4.6, spoofing here typically means a crafted request or content that misrepresents its origin, which can be leveraged to make phishing or social engineering against SharePoint users more convincing. It is not in CISA KEV and has no known ransomware association, so this is patch-in-cycle rather than an emergency.
Do this: Inventory your on-premises SharePoint 2016, 2019, and Subscription Edition farms and schedule the corresponding Microsoft security update in your next patch window.
AI-generated from public data, 2026-07-23. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-45483
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-45483
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 2.0%. CVSS 9.8 (Critical).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-45483
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-2026-45483. 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-2026-45483
Is CVE-2026-45483 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 2.0%.
What patch fixes CVE-2026-45483?
Microsoft fixed CVE-2026-45483 in KB5002873, KB5002874, KB5002880. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-45483?
Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
Can I ask my own AI about CVE-2026-45483?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-45483'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-2026-45483, 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.
