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CVE-2026-70345: Windows Installer Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-70345
Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows InstallerPrivilege escalationMemory corruption
What
A heap-based buffer overflow in Windows Installer permits an authorized attacker to elevate privileges locally.
Who is affected
Systems running Windows Installer with authorized users.
Urgency
High severity (CVSS 7.8); not currently exploited, but memory corruption flaws can be weaponized.
Action
Apply the latest Windows Update patches addressing CVE-2026-70345.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70345

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-70345coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Installer Elevation

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.

More from Microsoft Security Response Center