CVE-2026-85880

7.8

HIGH CVSS 3.1

Microsoft Windows Heap-Based Buffer Overflow Vulnerability - [Actively Exploited]

Overview

Description

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

Details

INFO

Published Date :

Sept. 8, 2026, 6:21 p.m.

Last Modified :

Sept. 24, 2026, 11:19 p.m.

Remotely Exploit :

No

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Sep 22, 2026

Alert Date: Sep 08, 2026 | 20 days ago

Description :

Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.

Required Action :

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.

Known Ransomware Campaign Use:

Unknown

Notes :

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-85880 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-85880

Impact

Affected Products

The following products are affected by CVE-2026-85880 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_10
2	Microsoft	windows_server_2012
3	Microsoft	windows_server_2016
4	Microsoft	windows_server_2019
5	Microsoft	windows_10_1607
6	Microsoft	windows_10_1809
7	Microsoft	windows_10_21h2
8	Microsoft	windows_10_22h2
9	Microsoft	windows_server_2022
10	Microsoft	windows_server_2012_r2

: Total Affected Vendor : 1 | Products : 10

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS					134c704f-9b21-4f2e-91b3-4a467353bcc0
	CVSS 3.1	HIGH				[email protected]

Solution

Apply vendor security updates promptly to patch known vulnerabilities.

Install September 2026 security updates.
Verify all systems are updated.
Restart services if required.
Test system functionality.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-85880.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85880	US Government Resource

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-85880 is associated with the following CWEs:

CWE-122: Heap-based Buffer Overflow

CWE-908: Use of Uninitialized Resource

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-85880 weaknesses.

CAPEC-92: Forced Integer Overflow Forced Integer Overflow

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-85880 vulnerability anywhere in the article.

The Hacker News

Chinese Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy CLEANGULP Malware

A Chinese threat actor codenamed UTA0565 has been observed exploiting the recently disclosed Google Chrome-Microsoft Windows exploit chain as zero-days through fake websites. The attacks, detected on ...

Published Date: Sep 23, 2026 (5 days, 14 hours ago)

The Hacker News

China-Linked Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy GRIMWEDGE

A Chinese threat actor has been attributed to a spear-phishing campaign that exploits recently patched security flaws in Google Chrome and Microsoft Windows to deliver a malicious JavaScript backdoor ...

Published Date: Sep 15, 2026 (1 week, 6 days ago)

Krypt3ia

Weekly ALL-SOURCE Cyber Warfare Intelligence Brief 9.14.26

Reporting period: September 7–14, 2026Scope: State and state-aligned cyber operations, APT activity, technical campaign intelligence, active exploitation, and cyber-enabled military/intelligence activ ...

Published Date: Sep 14, 2026 (2 weeks ago)

security.nl

Google Chrome-gebruikers op Windows 10 doelwit zeroday-aanval

Gebruikers van Google Chrome op Windows 10 zijn het doelwit geworden van een zeroday-aanval, zo meldt cybersecuritybedrijf Proofpoint. De aanvallers combineerden drie kwetsbaarheden waar op het moment ...

Published Date: Sep 10, 2026 (2 weeks, 4 days ago)

TheCyberThrone

CISA KEV Update – 8 Vulnerabilities Added in Two Days

CISA’s Known Exploited Vulnerabilities (KEV) Catalog saw a significant two-day update on September 8 and September 9, 2026, with eight vulnerabilities added based on evidence of active exploitation.CI ...

Published Date: Sep 10, 2026 (2 weeks, 4 days ago)

The Hacker News

Four Spy Groups Used the Same Chrome and Windows Exploit Kit Within a Week

Multiple espionage-motivated threat activity clusters have been found deploying a previously undocumented exploit kit called BlueMoon that chains together multiple vulnerabilities in Microsoft Windows ...