SB2026071634 - Multiple vulnerabilities in Microsoft Windows File Explorer
Published: July 16, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2026-33842)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
2) Information disclosure (CVE-ID: CVE-2026-41087)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
3) Use of uninitialized resource (CVE-ID: CVE-2026-57084)
CWE-ID: CWE-908 - Use of Uninitialized Resource
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to bypass certain security restrictions.
The vulnerability exists due to usage of uninitialized resources in Windows File Explorer. A local attacker can trigger uninitialized usage of resources and gain access to sensitive information on the target system.
4) Information disclosure (CVE-ID: CVE-2026-50456)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
5) Information disclosure (CVE-ID: CVE-2026-50389)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
6) Information disclosure (CVE-ID: CVE-2026-50442)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
7) Information disclosure (CVE-ID: CVE-2026-50473)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows File Explorer. A local user can gain unauthorized access to sensitive information on the system.
8) Use of uninitialized resource (CVE-ID: CVE-2026-40422)
CWE-ID: CWE-908 - Use of Uninitialized Resource
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to bypass certain security restrictions.
The vulnerability exists due to usage of uninitialized resources in Windows File Explorer. A local user can pass specially crafted data to the application, trigger uninitialized usage of resources and gain access to sensitive information on the system.
Remediation
Install update from vendor's website.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33842
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41087
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57084
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50456
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50389
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50442
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50473
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40422