SB2026011497 - Privilege escalation in Microsoft Windows Telephony Service
Published: January 14, 2026
Security Bulletin ID
SB2026011497
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) External Control of File Name or Path (CVE-ID: CVE-2026-20931)
CWE-ID: CWE-73 - External Control of File Name or Path
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to external control of file name or path in Windows Telephony Service. A remote user on the local network can gain elevated privileges on the system.
Remediation
Install update from vendor's website.