SB2026021058 - Remote code execution in Microsoft MSHTML Framework
Published: February 10, 2026 Updated: February 27, 2026
Security Bulletin ID
SB2026021058
Severity
Critical
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 security vulnerability.
1) Protection Mechanism Failure (CVE-ID: CVE-2026-21513)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient implementation of security measures within the ieframe.dll component when handling hyperlinks. An attacker can trick the the victim into clicking on a specially crafted link or on a shortcut (.lnk) file and execute arbitrary code on the system.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.