Heap-based Buffer Overflow in Windows ALPC Affects Microsoft Products
CVE-2026-85880

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
8 September 2026

Badges

👾 Exploit Exists🦅 CISA Reported📰 News Worthy

What is CVE-2026-85880?

CVE-2026-85880 is a critical vulnerability affecting Microsoft products, specifically linked to a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC) system. This flaw allows an authorized user to elevate their privileges on a compromised system, potentially enabling them to execute malicious code with elevated rights. The vulnerability poses a significant risk as it can compromise the integrity and confidentiality of affected systems, especially in environments where user access is already granted but can lead to greater control by attackers. Organizations relying on Microsoft products could face severe operational disruptions and data security breaches if this vulnerability is successfully exploited.

Potential Impact of CVE-2026-85880

  1. Privilege Escalation: The primary impact of this vulnerability is its potential to allow unauthorized users to gain administrative rights, which can lead to full control over affected systems. An attacker could exploit this to manipulate system settings, access sensitive data, and alter critical applications.

  2. Increased Attack Surface: Successful exploitation of CVE-2026-85880 could enable attackers to deploy further malware or conduct additional attacks within the network, increasing the attack surface and complicating incident response efforts.

  3. Data Breaches and Compliance Risks: Organizations facing exploitation may suffer data breaches, leading to loss of sensitive information and possible violations of regulatory requirements. This could result in significant financial liabilities, reputational damage, and a loss of customer trust.

CISA has reported CVE-2026-85880

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-85880 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9512

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.9245

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7725

News Articles

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References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • đź“°

    First article discovered by theregister

  • đź‘ľ

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

.