SB2026011387 - Remote code execution in Microsoft Inbox COM Objects (Global Memory)
Published: January 13, 2026
Security Bulletin ID
SB2026011387
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-21219)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Inbox COM Objects (Global Memory). A remote attacker can win a race condition and execute arbitrary code on the target system.
Remediation
Install update from vendor's website.