CVE-2026-108467 – Microsoft PostScript Printer Driver Remote Code Execution Vulnerability

Microsoft has released a security update on October 13, 2026, addressing CVE-2026-108467, a Critical remote code execution vulnerability in the Microsoft PostScript Printer Driver. The vulnerability is caused by a heap-based buffer overflow that could allow an authenticated attacker with low-level access to send a specially crafted network request and execute malicious code on an affected server. With low attack complexity and no user interaction required, successful exploitation could expose sensitive information, compromise critical Windows systems, and disrupt business operations.

CVSS Score: 8.8

SEVERITY: Not explicitly stated in the CVSS:3.1 Metrics (Microsoft Max Severity: Critical).

Threat

The primary threat is remote code execution through a memory corruption weakness in the Microsoft PostScript Printer Driver.

An attacker with valid low-level credentials could send a specially crafted request to an affected Windows server and potentially execute unauthorized code. Because the attack requires no user interaction and has low attack complexity, it could present a serious risk in environments where vulnerable services are accessible to authenticated users over the network.

Organizations using shared Windows infrastructure or systems that support network printing could face increased exposure, particularly if attackers obtain access to a standard user account.

The vulnerability could also provide an opportunity for attackers who have already compromised a low-privilege account to expand their access within an organization’s network.

Exploits

• Publicly Disclosed: No
• Actively Exploited: No
• Public Proof-of-Concept (PoC): Not confirmed; exploit code maturity is listed as Unproven.
• Exploitability Assessment: Exploitation Less Likely

Microsoft indicates that exploitation is less likely, and no active exploitation has been reported in the available vulnerability information.

However, the vulnerability’s low attack complexity, network attack vector, and lack of user interaction requirements make it important to address before attackers discover a reliable exploitation method.

Technical Summary

CVE-2026-108467 is a heap-based buffer overflow vulnerability, classified as CWE-122, affecting the Microsoft PostScript Printer Driver.

A heap-based buffer overflow occurs when software writes more data into a dynamically allocated memory area than it can safely hold. This can corrupt adjacent memory, interfere with normal application behavior, and potentially allow an attacker to execute malicious code.

In this case, an authenticated attacker with low-level access to an affected server could send a specially crafted request over the network to trigger the vulnerability. Successful exploitation could allow the attacker to execute code on the server.

The CVSS v3.1 metrics identify several important characteristics:

• Attack Vector: Network, allowing an attacker to exploit the vulnerability remotely.
• Attack Complexity: Low, indicating that exploitation does not require unusually complex conditions.
• Privileges Required: Low, meaning the attacker needs only limited authenticated access.
• User Interaction: None, meaning no action from another user is required.
• Scope: Unchanged, indicating that the impact remains within the affected security authority.
• Confidentiality: High, indicating the potential exposure of sensitive information.
• Integrity: High, indicating the possibility of unauthorized changes to system resources.
• Availability: High, indicating the potential for serious service disruption.

The exact permissions gained following successful exploitation are not specified in the available vulnerability information. However, the ability to execute code on an affected server could result in unauthorized system activity, data exposure, or disruption of essential services.

Exploitability

The affected Microsoft products include:

• Windows Server: 2012, 2012 R2, 2016, 2019, 2022, and 2025, including the listed Server Core installations.
• Windows 11: Versions 23H2, 24H2, 25H2, 26H1, and 26H2.
• Windows 10: Versions 1607, 1809, 21H2, and 22H2.

An authenticated attacker with low-level access could exploit the vulnerability by sending a specially crafted network request to an affected server. No user interaction is required.

Business Impact

CVE-2026-108467 represents a significant security risk to organizations operating Windows servers, shared printing infrastructure, and business systems that rely on affected PostScript printer driver components.

Because exploitation requires only low-level authenticated access, an attacker who compromises an ordinary user account could potentially use the vulnerability to execute malicious code on an affected server.

This creates an additional risk for organizations where multiple users share network resources or where printing services are accessible across internal networks.

Potential business consequences include:

• Server Compromise: Attackers could execute unauthorized code on vulnerable Windows systems.
• Sensitive Data Exposure: Confidential business information could potentially be accessed or stolen.
• Operational Disruption: Printing services and other affected server operations could become unavailable.
• Malware Deployment: Compromised systems could potentially be used to install malicious software or ransomware.
• Lateral Movement: Attackers could use a compromised server to attempt further attacks against connected systems.
• Financial and Reputational Damage: Security incidents could lead to downtime, incident response costs, and reduced customer confidence.

“A low-privilege account should never become a pathway to server compromise. This vulnerability shows how a weakness in a printer driver could put critical business systems at risk.”

Workaround

Until the official Microsoft security update can be applied, organizations should consider the following risk-reduction measures:

• Restrict access to Windows printing services and shared printer resources.
• Disable unnecessary printing services or affected printer drivers where operationally feasible.
• Limit network access to printing infrastructure using firewalls and network segmentation.
• Apply least-privilege controls to accounts that can access affected systems.
• Monitor servers for suspicious network requests and unusual printing-related activity.
• Deploy the appropriate Microsoft security updates promptly.

These measures may reduce exposure but are not confirmed fixes for the underlying vulnerability.

Urgency

CVE-2026-108467 carries a Critical maximum severity rating and a CVSS v3.1 base score of 8.8, reflecting the potentially severe impact of successful remote code execution.

The vulnerability is particularly concerning because exploitation requires only low-level authentication, has low attack complexity, and does not depend on user interaction.

Although Microsoft considers exploitation less likely and reports no known active exploitation, attackers who already possess valid user credentials could potentially exploit vulnerable servers if the affected components are accessible.

Organizations should prioritize identifying affected Windows systems, reviewing access to printing infrastructure, and deploying the October 2026 security updates through their established patch management processes.

“When a basic user account can potentially be used to execute code on a server, delaying a security patch can turn a limited compromise into a much larger incident.”