Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since September 8, 2026.
CVE-2026-85880
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Added to KEV September 8, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-85880
- CWE
- CWE-122CWE-908
- Affected products
- Windows · Microsoft Windows · Microsoft
What happened
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
What it means for your business
Microsoft Windows is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-85880). Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally. CISA remediation due date: 2026-09-22. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: September 22, 2026
Sources
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