SB2026081206 - Multiple vulnerabilities in Microsoft Windows Telephony Service
Published: August 12, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 11 vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-61353)
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 on the target system.
The vulnerability exists due to a boundary error in Windows Telephony Service. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.
2) Use-after-free (CVE-ID: CVE-2026-62701)
CWE-ID: CWE-416 - Use After Free
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 compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Telephony Service. A local user can gain elevated privileges on the target system.
3) Use-after-free (CVE-ID: CVE-2026-62725)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Telephony Service. A local user can win a race condition and gain elevated privileges on the target system.
4) Race condition (CVE-ID: CVE-2026-62729)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/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 on the system.
The vulnerability exists due to a race condition in Windows Telephony Service. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
5) Race condition (CVE-ID: CVE-2026-62748)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/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 on the system.
The vulnerability exists due to a race condition in Windows Telephony Service. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
6) Race condition (CVE-ID: CVE-2026-59122)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/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 on the system.
The vulnerability exists due to a race condition in Windows Telephony Service. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
7) Heap-based buffer overflow (CVE-ID: CVE-2026-62732)
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 on the target system.
The vulnerability exists due to a boundary error in Windows Telephony Service. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.
8) Use-after-free (CVE-ID: CVE-2026-62726)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Telephony Service. A local user can win a race condition and gain elevated privileges on the system.
9) Use-after-free (CVE-ID: CVE-2026-62724)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Telephony Service. A local user can win a race condition and gain elevated privileges on the system.
10) Race condition (CVE-ID: CVE-2026-62734)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/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 on the system.
The vulnerability exists due to a race condition in Windows Telephony Service. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
11) Use-after-free (CVE-ID: CVE-2026-62723)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Telephony Service. A local user can win a race condition and gain elevated privileges on the system.
Remediation
Install update from vendor's website.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61353
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62701
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62725
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62729
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62748
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59122
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62732
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62726
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62724
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62734
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62723