Patch tracker / CVE reference / CVE-2025-26645

CVE-2025-26645

CVE-2025-26645 is a Microsoft vulnerability that Microsoft rates Critical, with a CVSS score of 8.8 (High). Its EPSS score puts the probability of exploitation in the next 30 days at 62%. Microsoft has shipped the fix: deploy one of the 16 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
8.8
CVSS v3
62%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 62%. CVSS 8.8 (High).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-26645

CVE-2025-26645 is a remote code execution flaw in the Remote Desktop client, meaning the vulnerability triggers on the connecting machine when it reaches out to a malicious or compromised RDP server, not on the server being administered. Anyone running the Windows App Client for Windows Desktop or Windows 10 Version 1809 who initiates RDP sessions is exposed. The 59 percent EPSS score signals meaningful exploit likelihood even though this is not yet in CISA KEV or tied to ransomware.

Do this: Patch the Remote Desktop client on all admin workstations and Windows 10 1809 systems that connect outward, and restrict RDP connections to trusted internal hosts.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2025-26645

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 62%).
Fixed by KB5053594 and 15 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2025-26645

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5053594, KB5053596, KB5053598, KB5053599, KB5053602, KB5053603, KB5053606, KB5053618, KB5053620, KB5053627, KB5053636, KB5053638, KB5053886, KB5053887, KB5053888, KB5053995 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-2025-26645. 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.

KB5053594KB5053596KB5053598KB5053599KB5053602KB5053603KB5053606KB5053618KB5053620KB5053627KB5053636KB5053638KB5053886KB5053887KB5053888KB5053995

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-24985CVE-2025-24993CVE-2025-24983CVE-2025-26633CVE-2025-24054CVE-2025-24991CVE-2025-24984CVE-2024-9157
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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