Patch tracker / CVE reference / CVE-2025-26645

CVE-2025-26645

CVE-2025-26645 is a high severity Microsoft vulnerability with a CVSS score of 8.8. Its EPSS score puts the probability of exploitation in the next 30 days at 59%. 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

59%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 59%. CVSS 8.8 (High).

This CVE is among the top half 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.

I am an IT admin assessing a vulnerability. Facts for CVE-2025-26645 (source: https://senserva.com/cve/CVE-2025-26645.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-26645: High severity Microsoft vulnerability, CVSS 8.8
- EPSS 30-day exploitation probability: 59%
- Actively exploited (CISA KEV): no
- Fixed by: KB5053594, KB5053596, KB5053598, KB5053599, KB5053602, KB5053603, KB5053606, KB5053618, KB5053620, KB5053627, KB5053636, KB5053638, KB5053886, KB5053887, KB5053888, KB5053995
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 59%).

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.

KB5053594 KB5053596 KB5053598 KB5053599 KB5053602 KB5053603 KB5053606 KB5053618 KB5053620 KB5053627 KB5053636 KB5053638 KB5053886 KB5053887 KB5053888 KB5053995

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-24985 CVE-2025-24993 CVE-2025-24983 CVE-2025-26633 CVE-2025-24054 CVE-2025-24991 CVE-2025-24984 CVE-2024-9157

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

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