— Unscored

Microsoft Windows Heap-Based Buffer Overflow Vulnerability

CVE-2026-85880 Exploited

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

Being exploited in the wild

Catalogued 8 September 2026 · US federal remediation deadline 22 September 2026

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…

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV
Published: 8 September 2026
Last updated: 8 September 2026
Affected: Microsoft · Windows
Weakness: CWE-122, CWE-908

At the source

CISA KEV

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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