CVE-2026-69829: Windows Shell Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-69829

Heap-based buffer overflow in Windows Shell allows an unauthorized attacker to execute code over a network.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-09-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69829

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.

Moderate exploitation riskCVE-2026-698291.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-69829	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
unknownNCSC-2026-0353 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Windowsncsc-nl
criticalCVE-2026-69829: Heap-based buffer overflow in Windows Shell allows an unauthorized attacker to execute code ov…nvd

Recent advisories for Windows Shell Remote

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-2026-47827: Command Injection in BOSH CLI tool on windows in Cloud Foundry allows a remote attacker to exe…nvd · 2026-08-21
criticalexploitedCVE-2018-8414: Microsoft Windows Shell Remote Code Execution Vulnerabilitycisa-kev · 2022-03-25
criticalexploitedCVE-2017-8464: Microsoft Windows Shell (.lnk) Remote Code Execution Vulnerabilitycisa-kev · 2022-02-10