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MSHTML Framework 0-Day Exploited by APT28 Hackers Before Feb 2026’s Patch Tuesday Update

## Cybersecurity: MSHTML Framework Vulnerability Exploited by APT28

TBy Thomas BlakeMar 02, 20261 min read

Cybersecurity: MSHTML Framework Vulnerability Exploited by APT28

A zero-day vulnerability in the Microsoft HTML (MSHTML) framework has been identified and actively exploited. This vulnerability, designated as CVE-2026-21513 , permits attackers to bypass security protocols and execute arbitrary code, affecting all Windows versions. It has been assigned a CVSS score of 8.8.

The vulnerability was discovered by security researchers at Akamai, who noted that the Russian state-sponsored threat group, APT28, targeted Microsoft prior to the release of a patch in February 2026.

Akamai employed PatchDiff-AI, a multi-agent AI system, to conduct automated root-cause analysis. The flaw is located in the ieframe.dll , specifically within the _AttemptShellExecuteForHlinkNavigate function, responsible for handling hyperlink navigation.

Feature Details

CVE ID CVE-2026-21513

CVSS Score 8.8 (High)

Affected Component MSHTML Framework ( ieframe.dll )

A zero-day vulnerability in the Microsoft HTML (MSHTML) framework has been identified and actively exploited.
Thomas Blake · Thehackingpost

Impact Security Feature Bypass, Arbitrary Code Execution

Patch Date February 2026 Patch Tuesday

The vulnerability arises from insufficient validation of target URLs, allowing attacker-controlled input to reach code paths that invoke ShellExecuteExW . Consequently, local or remote resources can be executed outside the intended browser security context.

The exploit involves the use of nested iframes and multiple Document Object Model (DOM) contexts to manipulate trust boundaries, bypassing the Mark of the Web (MotW) and Internet Explorer Enhanced Security Configuration (IE ESC). This technique enables the execution of arbitrary code.

Microsoft addressed this vulnerability in the February 2026 Patch Tuesday update, enhancing validation for hyperlink protocols to ensure that supported protocols like file:// , http:// , and https:// execute within the browser context.

Akamai researchers have identified the following IOCs to assist network defenders:

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Name Indicator

document.doc.LnK aefd15e3c395edd16ede7685c6e97ca0350a702ee7c8585274b457166e86b1fa

Domain wellnesscaremed.com

MITRE Techniques T1204.001, T1566.001

While the observed attacks utilize specific campaigns involving malicious .LNK files, the vulnerability can be triggered by any component embedding MSHTML. It is recommended that organizations apply the February 2026 security updates to mitigate this risk and remain vigilant against alternative delivery mechanisms.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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