CVE-2026-83657
published 2026-10-13CVE-2026-83657: Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
PriorityP430medium5.5CVSS 3.1
AVLACLPRLUINSUCNIHAN
EPSS
0.27%
19.9th percentile
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1809 | < 10.0.17763.9376 | 10.0.17763.9376 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.9376 | 10.0.17763.9376 |
| microsoft | windows_server_2019 | < 10.0.17763.9376 | 10.0.17763.9376 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.9376 | 10.0.17763.9376 |
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VulDB
Microsoft Windows 10 1809/Server 2019 improper authorization
vuldb·2026-10-14·CVSS 5.5
CVE-2026-83657 [MEDIUM] Microsoft Windows 10 1809/Server 2019 improper authorization
A vulnerability was found in Microsoft Windows 10 1809/Server 2019. It has been declared as problematic. This vulnerability affects unknown code. The manipulation results in improper authorization.
This vulnerability is reported as CVE-2026-83657. The attack requires a local approach. No exploit exists.
It is recommended to upgrade the affected component.
GHSA
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
ghsa_unreviewed·2026-10-13
CVE-2026-83657 [MEDIUM] CWE-1390 Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
No detection rules found.
No public exploits indexed.
Sans Isc
October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
blogs_sans_isc·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
October 2026 Microsoft Patch Tuesday
Published: 2026-10-13. Last Updated: 2026-10-13 19:25:52 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today's patch Tuesday, and one is already exploited.
CVE-2026-96951: An already exploited Windows Shell Security Feature Bypass Vulnerability. This vulnerabliity allows bypassing the "Mark of the Web" making it easier to exeucte code by sending a malicious message to a user via e-mail or instant messaging. The victim will still have to open the file.
CVE-2026-108398: This vulnerability, a .NET framework security feature bypass, could be
Rapid7
Patch Tuesday - October 2026
blogs_rapid7·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] Patch Tuesday - October 2026
Microsoft is publishing 1,413 own-product vulnerabilities on October 2026 Patch Tuesday , including 1,102 vulnerabilities in Windows. Anyone who enjoyed last month’s record-setting Patch Tuesday will love the October 2026 edition, because it’s much bigger still. As Rapid7 has noted over the course of 2026, there is every reason to suppose that vulnerability volumes will continue to rise. Microsoft is aware of exploitation in the wild for just one of the vulnerabilities published today, as well as public disclosure for two others.
## Windows Shell: zero-day security feature bypass
The Windows Shell is Microsoft’s term for the GUI interaction logic for the entire OS provided by explorer.exe and associated libraries and APIs, and for the second time this year , the Windows Shell is the site
2026-10-13
Published