CVE-2026-69477: Microsoft Office Access Remote Code Execution Vulnerability

highCVSS 7.3CVE-2026-69477

Heap-based buffer overflow in Microsoft Office Access allows an authorized attacker to execute code locally.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.3
Published: 2026-09-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69477

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.

Low exploitation riskCVE-2026-694770.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-69477	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Microsoft Office Access

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.

mediumCVE-2026-81401: Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows…nvd · 2026-09-08
mediumCVE-2026-72938: Access of resource using incompatible type ('type confusion') in Microsoft Office PowerPoint a…nvd · 2026-09-08
highCVE-2026-69778: Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execu…nvd · 2026-09-08
highCVE-2026-69614: Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to exec…nvd · 2026-09-08
highCVE-2026-69529: Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execu…nvd · 2026-09-08
highCVE-2026-69477: Heap-based buffer overflow in Microsoft Office Access allows an authorized attacker to execute…nvd · 2026-09-08