CVE-2026-64919
published 2026-08-11CVE-2026-64919: Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
PriorityP346high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
0.30%
22.7th percentile
Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | access | — | — |
| microsoft | microsoft_365_apps_for_enterprise | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_access_2016 | >= 16.0.0 < 16.0.5565.1000 | 16.0.5565.1000 |
| microsoft | microsoft_office_2019 | >= 19.0.0 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_ltsc_2021 | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_ltsc_2024 | >= 16.0.0 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
VulDB
Microsoft 365 Apps for Enterprise/Access/Office/Office LTSC stack-based overflow (EUVD-2026-56721 / Nessus ID 334625)
vuldb·2026-08-22·CVSS 7.8
CVE-2026-64919 [HIGH] Microsoft 365 Apps for Enterprise/Access/Office/Office LTSC stack-based overflow (EUVD-2026-56721 / Nessus ID 334625)
A vulnerability labeled as problematic has been found in Microsoft 365 Apps for Enterprise, Access, Office and Office LTSC. Impacted is an unknown function. The manipulation results in stack-based buffer overflow.
This vulnerability is cataloged as CVE-2026-64919. The attack must be initiated from a local position. There is no exploit available.
It is best practice to apply a patch to resolve this issue.
GHSA
Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
ghsa_unreviewed·2026-08-11
CVE-2026-64919 [HIGH] CWE-121 Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - August 2026
blogs_rapid7·2026-08-11·CVSS 7.2
CVE-2026-68821 [HIGH] Patch Tuesday - August 2026
Microsoft is publishing 421 vulnerabilities on August 2026 Patch Tuesday , including 236 vulnerabilities in Windows. This is lower volume than last month’s record-breaking behemoth, but still one of the largest Patch Tuesday totals ever. There is no reason to suppose that Patch Tuesday will ever return to the lower volumes we saw prior to 2026. Microsoft is aware of exploitation in the wild for one of the vulnerabilities published today, as well as public disclosure for two others, although the Notable CVEs section of the Security Update Guide omits one of these. As usual, browser vulns are not included in the Patch Tuesday count above, but unusually, Microsoft does not appear to have published any desktop browser security patches so far this month.
## Summary charts
## Summary tables
#
Sans Isc
Microsoft Patch Tuesday August 2026, (Tue, Aug 11th)
blogs_sans_isc·2026-08-11·CVSS 7.8
CVE-2026-68820 [HIGH] Microsoft Patch Tuesday August 2026, (Tue, Aug 11th)
Microsoft Patch Tuesday August 2026
Published: 2026-08-11. Last Updated: 2026-08-11 17:54:49 UTC
by Renato Marinho (Version: 1)
0 comment(s)
This month we got patches for 418 vulnerabilities. Of these, 62 are critical, 1 is being exploited in the wild, and 2 were publicly disclosed as zero-days. Notable fixes include Windows privilege escalation, container tampering, and critical QUIC and DNS Server remote code execution bugs.
A few vulnerabilities worth mentioning:
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability (CVE-2026-68820)
This Important-severity elevation of privilege vulnerability is listed by Microsoft as exploited in the wild but not publicly disclosed, and it has a CVSS score of 7.0. The flaw is a use-after-free issue in the Windows Ancil
2026-08-11
Published