What is CVE-2026-85880?
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
The record classifies CVE-2026-85880 under weakness classes CWE-122, CWE-908. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 52 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - CISA KEV
- Listed since 2026-09-08, federal remediation deadline 2026-09-22
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-09-08, last modified 2026-09-09
Is CVE-2026-85880 being exploited?
CISA added CVE-2026-85880 to the Known Exploited Vulnerabilities catalog on 2026-09-08, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-22 under BOD 22-01. It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation)
How to fix CVE-2026-85880
The record marks a vendor fix as available for CVE-2026-85880. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880. Because CVE-2026-85880 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-22. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-85880
5 tracked threats in the Threadlinqs corpus reference CVE-2026-85880, either in the campaign’s CVE list or as an indicator on the campaign record.
- September 2026 Major Cyber Attacks: ShinyHunters FBIJobs/PeopleSoft (CVE-2026-35273), Clop Leak Site Grav CMS Hijack (CVE-2026-42608), PaperCut AI-Agent Campaign, BlueMoon Zero-Day Chain, NetScaler C2 (CVE-2026-88771) — CRITICAL · 2026-10-27
- BlueMoon Exploit Kit Chains Chrome V8 Flaws CVE-2026-85046 and CVE-2026-87491 with Windows Kernel LPE CVE-2026-85880 — CRITICAL · 2026-10-10
- UTA0565 Chains Chrome and Windows Zero-Days (CVE-2026-85046, CVE-2026-87491, CVE-2026-85880) to Deploy CLEANGULP Malware — CRITICAL · 2026-09-27
- September 2026 Microsoft Patch Tuesday — Record 966+ Vulnerabilities with Two Actively Exploited Zero-Days (CVE-2026-81963, CVE-2026-85880) and Multiple Critical Wormable RCEs — CRITICAL · 2026-09-08
- Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046) — CRITICAL · 2026-09-08
Sources
Enriched from CVE.org, NVD, CISA KEV. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.