Does CVE-2026-102225 Expose Windows Systems to Remote Code Execution?

Microsoft identified a remote code execution vulnerability in Windows Text Shaping, classified as CVE-2026-102225. The National Vulnerability Database assigns it a CVSS score of 8.8, marking it as high severity. This defect allows unauthorized attackers to execute code over a network, posing significant risks to enterprise environments relying on these Windows versions.

Root cause

The underlying issue is an out-of-bounds read error within the Windows Text Shaping engine. According to the Microsoft Security Update Guide, this memory safety flaw stems from weaknesses categorized as CWE-125 and CWE-197. These weaknesses indicate improper handling of memory boundaries during text processing operations, which can be exploited to run arbitrary code.

Attack path

An attacker can exploit this vulnerability remotely over a network without requiring prior authentication. The out-of-bounds read allows the attacker to access memory locations they should not reach. This access facilitates the execution of malicious code on the target system, potentially leading to full system compromise by an unauthorized actor.

Affected versions

Several Windows versions remain vulnerable until specific updates are applied. The affected configurations include:

• Windows 10 Version 1607 before build 10.0.14393.9612
• Windows 10 Version 1809 before build 10.0.17763.9376
• Windows 10 Version 21H2 before build 10.0.19044.7807
• Windows 10 Version 22H2 before build 10.0.19044.7807
• Windows 11 Version 23H2 before build 10.0.22631.7652

Mitigation

• Verify current Windows build numbers against the affected versions listed in the advisory.
• Ensure systems are updated to the specified safe builds or later versions.
• Monitor network traffic for unusual activity that might indicate exploitation attempts.
• Restrict network access to critical systems where possible to reduce exposure.

What it means for organisations

Teams should immediately assess which internal systems run vulnerable Windows builds. IT leaders must coordinate with security operations to monitor for exploitation indicators. Procurement teams should verify that suppliers maintain updated endpoints. This event highlights the need for rigorous patch management processes. Organizations must ensure that critical infrastructure is isolated or protected. Communication with stakeholders is essential to explain risk levels. Regular audits of software versions help prevent similar exposures.

What to do and how to stay safe: Microsoft

• Audit all Windows endpoints to identify those running vulnerable build numbers.
• Apply available updates to reach the specified safe builds as soon as possible.
• Monitor network logs for signs of unauthorized remote code execution attempts.
• Restrict external access to systems that cannot be immediately patched.

Step-by-step guide: Patch Testing Best Practices That Prevent Production Failures

General security guidance from the CloudSec Press newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the CVSS score for CVE-2026-102225?

The National Vulnerability Database rates CVE-2026-102225 as 8.8 High.

Which Windows versions are affected by this vulnerability?

Windows 10 versions 1607, 1809, 21H2, 22H2 and Windows 11 23H2 are affected.

Is authentication required to exploit this flaw?

No, the vulnerability allows unauthorized attackers to execute code over a network.