CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-85880
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-85880Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 45% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-85880 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedNCSC-2026-0353 [1.01] [M/H] Kwetsbaarheden verholpen in Microsoft Windowsncsc-nl
- unknownexploitedMicrosoft Monthly Security Update (September 2026)hkcert
- unknownexploitedSecurity Alert: Microsoft Releases September 2026 Security Updatesjpcert
- unknownexploitedMicrosoft security advisory – September 2026 monthly rollup (AV26-896) – Update 1cccs
- highexploitedCVE-2026-85880: Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges…nvd
- highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
- highexploitedCVE-2026-85880: Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerabilitymsrc
Recent advisories for Microsoft Windows Heap-Based
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-81353: Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker…nvd · 2026-09-08
- highCVE-2026-81352: Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker…nvd · 2026-09-08
- highCVE-2026-69601: Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attack…nvd · 2026-09-08
- highCVE-2026-69511: Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attack…nvd · 2026-09-08
- criticalCVE-2026-69491: Heap-based buffer overflow in Windows Microsoft DirectMusic allows an unauthorized attacker to…nvd · 2026-09-08
- highCVE-2026-69456: Heap-based buffer overflow in Microsoft Windows Speech allows an authorized attacker to elevat…nvd · 2026-09-08
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