CVE-2026-85880

high

Description

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

From the Tenable Blog

September 2026 Microsoft Patch Tuesday | Tenable®

Published: 2026-09-08

Microsoft patched 964 CVEs in September, the most ever in a Patch Tuesday release in its history, including two zero-day vulnerabilities exploited in the wild.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880

https://www.helpnetsecurity.com/2026/10/09/october-2026-patch-tuesday-forecast/

https://cyberscoop.com/volexity-uta0565-china-exploit-chain-chrome-microsoft/

https://thehackernews.com/2026/09/china-linked-hackers-exploit-chrome.html

https://securityaffairs.com/199104/apt/one-exploit-chain-two-espionage-campaigns-chrome-and-windows-under-fire.html

https://www.securityweek.com/bluemoon-exploit-kit-chains-recent-chrome-windows-zero-days/

https://www.bleepingcomputer.com/news/security/new-bluemoon-kit-exploited-windows-and-chrome-zero-day-flaws/

https://securityaffairs.com/198802/hacking/u-s-cisa-adds-microsoft-windows-n-able-n-central-and-adobe-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://securityaffairs.com/198783/apt/four-nation-state-actors-used-the-same-chrome-zero-day-exploit-kit-within-12-days.html

https://www.theregister.com/research/2026/09/09/novel-blue-moon-kit-targeting-chrome-and-windows-reflects-new-reality-of-ai-driven-exploits/5295399

https://www.proofpoint.com/us/blog/threat-insight/once-bluemoon-multiple-state-aligned-threat-actors-rapidly-adopt-novel-exploit

https://www.malwarebytes.com/blog/news/2026/09/microsoft-fixes-record-964-flaws-including-2-exploited-zero-days

https://www.infosecurity-magazine.com/news/microsoft-patch-tuesday-record/

https://www.helpnetsecurity.com/2026/09/09/september-2026-patch-tuesday-zero-days-sigred-successor/

https://thehackernews.com/2026/09/microsoft-patches-record-974-flaws.html

https://thehackernews.com/2026/09/four-spy-groups-used-same-chrome-and.html

https://securityaffairs.com/198705/security/microsofts-biggest-patch-tuesday-974-cves-2-zero-days-and-20-wormable-bugs.html

https://cyberscoop.com/china-espionage-groups-exploit-chain-zero-days/

https://www.securityweek.com/microsoft-patches-record-974-vulnerabilities-including-two-exploited-zero-days/

https://www.cisa.gov/news-events/alerts/2026/09/08/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://cyberscoop.com/microsoft-patch-tuesday-september-2026/

https://thehackernews.com/2026/09/chinese-hackers-exploit-chrome-windows.html

https://www.tenable.com/blog/microsofts-september-2026-patch-tuesday-addresses-964-cves-cve-2026-81963-cve-2026-85880

https://github.com/Puminunp/security-triage-agent

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85880

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-73365

Details

Source: Mitre, NVD

Published: 2026-09-08

Updated: 2026-09-24

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics