SB2026101425 - Multiple vulnerabilities in Microsoft Windows

Description

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-87706)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to escalate privileges to SYSTEM.

The vulnerability exists due to a heap-based buffer overflow in Windows Storage Spaces Controller when accessed locally. A local user can exploit the buffer overflow to escalate privileges to SYSTEM.

2) Heap-based buffer overflow (CVE-ID: CVE-2026-87707)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to escalate privileges to SYSTEM.

The vulnerability exists due to a heap-based buffer overflow in Windows Fax and Scan Service when used locally. A local user can exploit the buffer overflow to escalate privileges to SYSTEM.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-87706
• https://support.microsoft.com/help/5123065
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-87707
• https://support.microsoft.com/help/5123099