CVE-2026-72971
published 2026-08-11CVE-2026-72971: Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to…
PriorityP428medium5.5CVSS 3.1
AVLACLPRLUINSUCNIHAN
EPSS
0.36%
28.8th percentile
Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_11_26h1 | < 10.0.28000.2704 | 10.0.28000.2704 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.2704 | 10.0.28000.2704 |
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VulDB
Microsoft Windows up to 10.0.28000.2525 Container Isolation FS Filter Driver unionfs.sys privileges management
vuldb·2026-08-12·CVSS 5.5
CVE-2026-72971 [MEDIUM] Microsoft Windows up to 10.0.28000.2525 Container Isolation FS Filter Driver unionfs.sys privileges management
A vulnerability classified as very critical was found in Microsoft Windows. This vulnerability affects unknown code of the file unionfs.sys of the component Container Isolation FS Filter Driver. Executing a manipulation can lead to improper privilege management.
The identification of this vulnerability is CVE-2026-72971. The attack can only be executed locally. There is no exploit available.
Upgrading the affected component is advised.
GHSA
Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.
ghsa_unreviewed·2026-08-11
CVE-2026-72971 [MEDIUM] CWE-59 Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.
Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.
No detection rules found.
No public exploits indexed.
Hackernews
ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access
blogs_hackernews·2026-08-12·CVSS 7.0
CVE-2026-50656 [HIGH] ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access
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## ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access
The security researcher going by the name Chaotic Eclipse (aka INFINITE NIGHTMARE, MSNightmare, and Nightmare-Eclipse) has released a proof-of-concept (PoC) for a new Microsoft zero-day called ShieldBreak .
The vulnerability, rooted in Microsoft Defender for Windows, demonstrates a patch bypass for CVE-2026-50656 (CVSS score: 7.8), otherwise known as RoguePlanet .
RoguePlanet has been described as a race condition that, if successfully exploited, could grant an attacker the ability to spawn a shell with SYSTEM-level privileges, enabling them
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
#
Tenable
Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)
blogs_tenable·2026-08-11·CVSS 7.0
CVE-2026-68820 [HIGH] Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)
## Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)
42 Critical
355 Important
1 Moderate
0 Low
Microsoft addresses 398 CVEs in the eighth Patch Tuesday of 2026, with three zero-days, including one that was exploited in the wild.
Microsoft patched 398 CVEs in its August 2026 Patch Tuesday release, with 42 rated critical, 355 rated as important and one rated as moderate. Our counts omitted two CVEs assigned by MITRE; CVE-2026-6726 and CVE-2026-6727.
This month’s update includes patches for:
.NET
.NET Core
.NET Framework
AMD Zen
Active Directory Certificate Services (AD CS)
Application Information Services
Azure Active Directory
Azure CycleCloud
Azure Monitor Agent
Azure Storage Explorer
Capability Access Management Service (camsvc)
Desktop Window M
Qualys
Microsoft Patch Tuesday, August 2026 Security Update Review
blogs_qualys·2026-08-11
CVE-2026-72971 Microsoft Patch Tuesday, August 2026 Security Update Review
## Table of Contents
Microsoft Patch Tuesday forAugust2026
Zero-day Vulnerabilities Patched inAugustPatch Tuesday Edition
Critical Severity Vulnerabilities Patched inAugustPatch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Qualys Monthly Webinar Series
The August 2026 Microsoft Patch Tuesday release delivers security fixes for vulnerabilities affecting a wide range of Microsoft products and services. As attackers continue to exploit unpatched vulnerabilities, timely patching remains critical for reducing exposure and strengthening enterprise security.
## Microsoft Patch Tuesday for August 2026
This month’s release addresses 421 vulnerabilities, including 62 critical and 357 important-severity vulnerabilities.
In this month’s updates, Microsof
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
Krebs
Microsoft Plugs Nearly 400 Security Holes
blogs_krebs·2026-08-11·CVSS 7.8
CVE-2026-68820 [HIGH] Microsoft Plugs Nearly 400 Security Holes
Microsoft today released updates to remedy at least 398 security vulnerabilities in its Windows operating systems and supported software, including one weakness that is already being actively exploited and two others that were publicly detailed prior to today.
Image: Shutterstock, Mallika Home Studio.
August’s overstuffed bundle of patch joy from Microsoft did not eclipse its recording breaking release of more than 570 security updates last month , but it is double June’s then-record batch of nearly 200 fixes . Microsoft has attributed the recent patch deluge to vulnerability discoveries aided by artificial intelligence, and experts roundly agree that Windows users should get used to the idea of Patch Tuesdays (the second Tuesday of each month) covering hundreds of newly discovered secur
Crowdstrike
August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs
blogs_crowdstrike
CVE-2026-68820 August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs
August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs Aug 11, 2026
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August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs Aug 11, 2026
CrowdStrike Threat Hunts for Shell Command Obfuscation on VMware ESX Aug 07, 2026
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Helping Non-Security Stakeholders
2026-08-11
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